review crucials bx100 and mx200 solid state drives reviewed

Crucial’s BX100 and MX200 solid-state drives reviewed

When Micron introduced its M600 SSD in September, it was only a matter of time before the other shoe dropped. The memory giant fabs its own NAND and sells SSDs to PC makers and other corporate customers, but it doesn’t make Micron-branded drives available to everyday consumers. Instead, that market is covered by its Crucial division, which draws from the same pool of in-house technologies. Sooner or later, the M600’s funky SLC/MLC caching scheme was destined pop up in an equivalent Crucial product.

That product is the MX200, which Crucial announced at CES last month. The drive has the same DNA as the M600, and it’s already available for as little as $0.46/GB. But it’s not the whole story.

The MX200 fell into our laps alongside the BX100, an unexpected second shoe more akin to one of those minimalist, barefoot designs that’s basically just a glove for your foot. This trimmed-down alternative uses a completely different controller, and it has an even lower price tag. BX100 SSDs are currently selling for as little as $0.36/GB, making them among the cheapest around.

We’ve been testing the new drives to see how they compare to the current crop of contenders, and the results might surprise you. Turns out there’s something to those funky toe shoes, after all.

Same NAND, different controllers
The MX200 treads familiar territory, so that’s the best place to start. Like its M600 predecessor, the drive combines an eight-channel Marvell 88SS9189 controller with Micron’s own 16-nm NAND.

Each flash die packs 16GB of storage, making it easier to hit higher capacities. The higher-density dies create problems for lower-capacity drives, though. SSD controllers achieve peak performance by addressing multiple dies simultaneously, but smaller drives don’t have enough individual NAND chips to fully exploit that controller-level parallelism. Smaller SSDs typically have slower write performance ratings than their larger counterparts as a result.

The MX200 exposed

To counteract this problem, the MX200 takes advantage of a dynamic switching capability built into Micron’s 16-nm NAND. The flash can switch entire blocks between a single-bit SLC config, whose simpler programming mechanism enables higher write speeds, and a two-bit MLC config, whose greater bit density enables higher capacities. The MX200 writes incoming data to SLC blocks before moving it to MLC zones during idle downtime. The drive essentially treats its entire unused capacity as a dynamic write cache.

Appropriately dubbed Dynamic Write Acceleration, this caching scheme is a clever way to speed up the short, bursty writes typical of client workloads. However, the fact that SLC blocks have half the storage capacity of MLC ones creates problems for sustained transfers. Left unchecked, SLC writes could saturate the drive’s unused flash before its MLC capacity is exhausted. Dynamic Write Acceleration avoids this problem by shifting writes into MLC mode before the flash is completely consumed by SLC blocks. If writes remain relentless, the MX200 eventually starts moving previously cached data into MLC blocks while simultaneously handling incoming writes.

We can see the impact of this three-tiered approach by continuously writing data. This sequential write speed plot from my M600 review nicely illustrates how transfer rates change as the drive fills up:

The higher speeds up to the 46% mark illustrate the performance benefits of writing in SLC mode. The middle portion shows the hit associated with MLC writes, while everything past 58% highlights the severe penalty incurred when the drive is shuffling cached data alongside incoming writes. Yikes.

The 500GB and 1TB versions of the MX200 have a sufficient number of NAND chips for peak performance, so they don’t require Dynamic Write Acceleration. The feature is only enabled on the 250GB drive. It’s also active in the mSATA and M.2 versions of the MX200, both of which are available in 250GB and 500GB capacities. For those drives, write caching is enabled in part to improve power efficiency. Completing writes faster allows the MX200 to return quickly to a low-power state.

Apart from its caching setup, the MX200 mirrors the laundry list of features attached to other recent Crucial SSDs. It has a thermal throttling mechanism that reduces performance when the drive is in danger of overheating, hardware-accelerated AES encryption with support for the requisite IEEE and TCG Opal standards, and an extra layer of RAID-like protection to compensate for physical flash failures. Crucial also throws in a free copy of Acronis True Image HD to ease upgrades from existing systems.

The more budget-minded BX100 has none of that. Under “advanced features,” its spec sheet lists well-worn bullet points like TRIM support and active garbage collection—capabilities pretty much every SSD has had for years. Although the drive can monitor its internal temperature, thermal throttling isn’t part of the package. There’s no support for SLC caching, hardware-based encryption, or RAID-like internal protection. And no mini versions, either. The BX100 is only available in a 2.5″ form factor.

Smaller controller chip aside, the BX100 doesn’t look like any less of an SSD

As one might expect, homegrown flash is still part of the equation. The BX100 uses the same 16-nm NAND as the MX200, though the chips are addressed exclusively in MLC mode.

Instead of tapping yet another Marvell controller, the BX100 employs Silicon Motion’s SM2246EN. This four-channel chip has half as many parallel NAND channels, but each one supports transfer rates up to 400MB/s, so internal bandwidth remains plentiful. The most critical bottleneck is the Serial ATA interface, which tops out at less than 600MB/s for the drive as a whole.

As we saw in our review of the Silicon Motion-based Adata Premier SP610, modern four-bangers can mostly keep up with their eight-channel counterparts. Crucial’s performance specifications largely concur. Here are the essential stats for the BX100 and MX200 families. Note that the MX200 starts at 250GB, while the BX100 reaches down to 120GB.

Capacity Max sequential (MB/s) Max 4KB random (IOps) Endurance
Price $/GB
Read Write Read Write
BX100 120GB 535 185 87k 43k 72TB $69.99 $0.58
BX100 250GB 535 370 87k 70k 72TB $109.32 $0.44
MX200 250GB 555 500 100k 87k 80TB $139.99 $0.56
BX100 500GB 535 450 90k 70k 72TB $189.99 $0.38
MX200 500GB 555 500 100k 87k 160TB $249.99 $0.50
BX100 1TB 535 450 90k 70k 72TB $374.99 $0.37
MX200 1TB 555 500 100k 87k 320TB $469.99 $0.46

The BX100’s specs largely shadow those of the MX200, though the budget drive’s write speeds are only competitive at higher capacities. The lack of SLC caching really hurts the BX100 120GB and 250GB. Compare those to the MX200 250GB, which enjoys the same performance ratings as its larger siblings. In a moment, we’ll see how the 250GB and 500GB versions of each drive compare in a broad range of tests.

Crucial’s three-year warranty is the same for both drives, but the MX200 has a much higher endurance specification. The 1TB incarnation is rated to withstand 320TB of total writes, a limit that scales down predictably with the total capacity. Meanwhile, the BX100 is rated for 72TB of writes across the board.

Even 72TB is a heck of a lot of writes for a consumer-grade drive. The SSDs in my main desktop are only subjected to a few terabytes of writes per year, and most folks seem to be in the same boat. At that pace, it would take more than a decade just to burn through the BX100. Also, keep in mind that our ongoing SSD Endurance Experiment has demonstrated that SSDs can endure substantially more writes than their official specifications promise.

Curious users can monitor SSD health using Crucial’s new Storage Executive software. This utility displays SMART attributes that log host writes, bad blocks, important errors, and other statistics. The main monitoring pane also shows the MX200’s host writes, but that field is conspicuously absent for the BX100. Weirdly, the required data is still accessible via the SMART attributes.

Storage Executive is a surprisingly bulky 150MB download for something that runs in a web browser. At least the utility has some other functions, including a firmware updater and a secure-erase tool. It doesn’t run automatically when the system is booted, either, making it less obtrusive than some other SSD software.

As usual, we’ve tested Crucial’s new hotness against a staggeringly deep field of SSDs from the past few years. The benchmarking bonanza begins on the next page.


CrystalDiskMark — transfer rates
TR regulars will notice that we’ve trimmed a few tests from our usual suite of storage results. The drives were all benchmarked in the same way, but we’ve excluded the results for tests that have grown problematic or less relevant over time. This may be the last review to use our current suite and test systems. We’ve already started testing drives on new rigs—and with a fresh batch of benchmarks. Stay tuned for those results soon.

First, we’ll tackle sequential performance with CrystalDiskMark. This test runs on partitioned drives with the benchmark’s default 1GB transfer size and randomized data.

We’ve color-coded the results to make the BX100 and MX200 easier to spot. The M600 is highlighted in a separate shade, providing a reference point for the MX200’s Micron counterpart. Crucial’s older SSDs are also colored to set them apart from the rest of the fray.

The BX100s make an impression right off the bat, posting nearly the fastest sequential read speeds we’ve ever measured. The MX200s aren’t far behind.

CrystalDiskMark’s sequential write speed test turns the tables somewhat. Although the MX200s remain comfortably in the middle of the pack, just behind the fastest contenders, the BX100s tumble down the standings. The 250GB drive is the hardest hit, though it’s still faster than the equivalent MX100, Crucial’s previous budget leader.

HD Tune — random access times
Next, we’ll turn our attention to random access times. We used HD Tune to measure access times across multiple transfer sizes. SSDs have near-instantaneous seek times, so it’s hard to graph the results on the same scale as mechanical drives. The WD Black and Seagate SSHD will sit out this round to focus our attention on the SSDs.

Most of the SSDs are evenly matched, with access times ranging from instantaneous to slightly more instantaneous. It’s hard to get excited about differences of only a few microseconds.

The field spreads out a little in the 1MB write test, though. The MX200 250GB turns in the slowest time of the bunch, and the M600 256GB isn’t much faster. Odds are Dynamic Write Acceleration is at fault.

The BX100 250GB isn’t exactly a speed demon with 1MB random writes, either, but it’s way quicker than the equivalent MX200 and slightly ahead of the MX100.


TR FileBench — Real-world copy speeds
FileBench, which was concocted by TR’s resident developer Bruno “morphine” Ferreira, runs through a series of file copy operations using Windows 7’s xcopy command. Using xcopy produces nearly identical copy speeds to dragging and dropping files using the Windows GUI, so our results should be representative of typical real-world performance. We tested using the following five file sets—note the differences in average file sizes and their compressibility. We evaluated the compressibility of each file set by comparing its size before and after being run through 7-Zip’s “ultra” compression scheme.

  Number of files Average file size Total size Compressibility
Movie 6 701MB 4.1GB 0.5%
RAW 101 23.6MB 2.32GB 3.2%
MP3 549 6.48MB 3.47GB 0.5%
TR 26,767 64.6KB 1.7GB 53%
Mozilla 22,696 39.4KB 923MB 91%

The names of most of the file sets are self-explanatory. The Mozilla set is made up of all the files necessary to compile the browser, while the TR set includes years worth of the images, HTML files, and spreadsheets behind my reviews. Those two sets contain much larger numbers of smaller files than the other three. They’re also the most amenable to compression.

To get a sense of how aggressively each SSD reclaims flash pages tagged by the TRIM command, the SSDs are tested in a simulated used state after crunching IOMeter’s workstation access pattern for 30 minutes. The drives are also tested in a factory fresh state, right after a secure erase, to see if there is any discrepancy between the two states. There wasn’t much of one with the BX100 and MX200, so we’re only presenting the used-state scores.

Sorry. I probably should have told you to lube your scroll wheel before whipping through all those graphs.

The MP3, movie, and RAW sets are dominated by larger files, and the MX200 has an edge over the BX100 in those tests. Notice how the MX200 250GB largely keeps pace with its 500GB counterpart, while the smaller BX100 trails its larger twin by wider margins. The MX200 250GB’s Dynamic Write Acceleration seems to pay dividends here.

The smaller files in the Mozilla and TR sets belong to the BX100, however. The 500GB version even takes the top spot overall in the TR test, just a smidgen ahead of an Adata drive based on the same Silicon Motion controller.


TR DriveBench 2.0 — Disk-intensive multitasking
DriveBench 2.0 is a trace-based test comprised of nearly two weeks of typical desktop activity peppered with intense multitasking loads. More details on are available on this page of our last major SSD round-up.

We measure DriveBench performance by analyzing service times—the amount of time it takes drives to complete I/O requests. Those results are split into reads and writes.

The BX100 surprises once again. Both versions have low mean service times for reads and writes. The MX200 500GB also fares well, but the 250GB exhibits clear weakness. It’s not particularly quick with reads, and it’s downright slow with writes.

The M600 256GB is even worse off, possibly because its higher capacity leaves less overprovisioned area for the controller. Dynamic Write Acceleration likely plays a role in the poor performance of both drives. DriveBench 2.0 squeezes an awful lot of writes into a relatively short span, and the caching scheme probably isn’t tuned for such a heavy workload. Also, the idle time provided for garbage collection may be too short to allow the driver to transfer cached data to main storage.

All the SSDs execute the vast majority of DriveBench requests in one millisecond or less—too little time for end users to perceive. We can also sort out the number of service times longer than 100 milliseconds, which is far more interesting data. These extremely long service times make up only a fraction of the overall total, but they’re much more likely to be noticeable.

These metrics paint a brighter picture of Dynamic Write acceleration, at least as it’s employed in the MX200 250GB. That drive logs a fraction of the sluggish writes reported by the M600 256GB—and by the BX100. It’s still a few orders of magnitude off the leaders, but it’s a big improvement over Crucial’s older SSDs.

The BX100 250GB suffers more slow writes than we’d like, especially compared to its 500GB twin. Again, though, Crucial has clearly outdone its previous offerings. The older MX100 has more service times over 100 milliseconds with both reads and writes.


Our IOMeter workload features a ramping number of concurrent I/O requests. Most desktop systems will only have a few requests in flight at any given time (87% of DriveBench 2.0 requests have a queue depth of four or less). We’ve extended our scaling up to 32 concurrent requests to reach the depth of the Native Command Queuing pipeline associated with the Serial ATA specification. Ramping up the number of requests also gives us a sense of how the drives might perform in more demanding enterprise environments.

We run our IOMeter test using the fully randomized data pattern, which presents a particular challenge for SandForce’s write compression scheme. We’d rather measure SSD performance in this worst-case scenario than using easily compressible data.

There’s too much data to show clearly on a single graph, so we’ve split the results. You can compare the BX100 and MX200 to the competition by clicking the buttons below each graph.

Instead of presenting the results of multiple access patterns, we’re concentrating on IOMeter’s database test. This access pattern has a mix of read and write requests, and it’s similar to the file server and workstation tests. The results for these three access patterns are usually pretty similar. We also run IOMeter’s web server access pattern as part of our standard suite of tests, but it’s made up exclusively of read requests, so the results aren’t as applicable to real-world scenarios. Our own web servers log a fair amount of writes, for example.

The BX100 250GB and 500GB are evenly matched in IOMeter. The MX200 250GB delivers slightly more IOps than those drives across our escalating load, while the 500GB leaves them in the dust. Even the BX100s compare favorably to Crucial’s older SSDs, especially the MX100 256GB.

Versus the rest of the field, the BX100s are middle-of-the-pack performers. That’s pretty good considering their pricing. With few exceptions, the only drives that score higher cost substantially more.

Even without a bargain-basement sticker on its side, the MX200 500GB still looks strong. It has among the highest I/O rates at the low queue depths typical of desktop workloads. The 250GB version turns in a respectable overall performance, too, but it’s clearly a step behind.

Boot duration
Before timing a couple of real-world applications, we first have to load the OS. We can measure how long that takes by checking the Windows 7 boot duration using the operating system’s performance-monitoring tools. This is actually the first test in which we’re booting Windows off each drive; up until this point, our testing has been hosted by an OS housed on a separate system drive.

Level load times
Modern games lack built-in timing tests to measure level loads, so we busted out a stopwatch with a couple of titles.

All the SATA SSDs we’ve tested over the past few years have been within about a second of each other in these tests. I’m hopeful our new load-time tests—and PCIe SSDs—can tease out more meaningful differences. Stay tuned.

Power consumption
We tested power consumption under load with IOMeter’s workstation access pattern chewing through 32 concurrent I/O requests. Idle power consumption was probed one minute after processing Windows 7’s idle tasks on an empty desktop.

Crucial’s new drives are relatively power-efficient. They consume less juice at idle than the company’s older models, and the BX100s are especially frugal under load. That drive’s four-channel controller probably consumes less power than the eight-channel chip in the MX200.

So ends our performance analysis. If you’re curious about the other SSDs in this review or about how we conduct our testing, hit up the methods section on the next page. Otherwise, feel free to skip ahead to the conclusion.


Test notes and methods
Here’s a full rundown of the SSDs we tested, along with their essential characteristics.

  Flash controller NAND
Adata Premier SP610 512GB Silicon Motion SM2246EN 20-nm Micron sync MLC
Adata Premier Pro SP920 512GB Marvell 88SS9189 20-nm Micron sync MLC
Corsair Force GT 240GB SandForce SF-2281 25-nm Intel sync MLC
Corsair Force LS 240GB Phison PS3108-S8 19-nm Toshiba Toggle MLC
Corsair Neutron 240GB LAMD LM87800 25-nm Micron sync MLC
Corsair Neutron GTX 240GB LAMD LM87800 26-nm Toshiba Toggle MLC
Corsair Neutron XT 240GB Phison PS3110-S10 A19-nm Toshiba Toggle MLC
Crucial BX100 250GB Silicon Motion SM2246EN 16-nm Micron sync MLC
Crucial BX100 500GB Silicon Motion SM2246EN 16-nm Micron sync MLC
Crucial M500 240GB Marvell 88SS9187 20-nm Micron sync MLC
Crucial M500 480GB Marvell 88SS9187 20-nm Micron sync MLC
Crucial M500 960GB Marvell 88SS9187 20-nm Micron sync MLC
Crucial M550 256GB Marvell 88SS9189 20-nm Micron sync MLC
Crucial M550 512GB Marvell 88SS9189 20-nm Micron sync MLC
Crucial M550 1TB Marvell 88SS9189 20-nm Micron sync MLC
Crucial MX100 256GB Marvell 88SS9189 16-nm Micron sync MLC
Crucial MX100 512GB Marvell 88SS9189 16-nm Micron sync MLC
Crucial MX200 250GB Marvell 88SS9189 16-nm Micron sync SLC/MLC
Crucial MX200 500GB Marvell 88SS9189 16-nm Micron sync SLC/MLC
Intel 335 Series 240GB SandForce SF-2281 20-nm Intel sync MLC
Intel 520 Series 240GB SandForce SF-2281 25-nm Intel sync MLC
Intel 730 Series 480GB Intel PC29AS21CA0 20-nm Intel sync MLC
OCZ Vertex 4 256GB Indilinx Everest 2 25-nm Micron sync MLC
OCZ Vertex 450 256GB Indilinx Barefoot 3 M10 20-nm Micron sync MLC
OCZ Vertex 460 240GB Indilinx Barefoot 3 M10 19-nm Toshiba Toggle MLC
OCZ ARC 240GB Indilinx Barefoot 3 M10 A19-nm Toshiba Toggle MLC
Micron M600 256GB Marvell 88SS9189 16-nm Micron sync SLC/MLC
Micron M600 1TB Marvell 88SS9189 16-nm Micron sync SLC/MLC
SanDisk Extreme II 240GB Marvell 88SS9187 19-nm SanDisk Toggle SLC/MLC
Samsung 840 Series 250GB Samsung MDX 21-nm Samsung Toggle TLC
Samsung 840 EVO 250GB Samsung MEX 19-nm Samsung Toggle TLC
Samsung 840 EVO 500GB Samsung MEX 19-nm Samsung Toggle TLC
Samsung 840 EVO 1TB Samsung MEX 19-nm Samsung Toggle TLC
Samsung 840 Pro 256GB Samsung MDX 21-nm Samsung Toggle MLC
Samsung 850 EVO 250GB Samsung MGX 32-layer Samsung V-NAND TLC
Samsung 850 EVO 1TB Samsung MEX 32-layer Samsung V-NAND TLC
Samsung 850 Pro 512GB Samsung MEX 32-layer Samsung V-NAND MLC
Seagate 600 SSD 240GB LAMD LM87800 19-nm Toshiba Toggle MLC
Seagate Desktop SSHD 2TB NA 24-nm Toshiba Toggle SLC/MLC
WD Caviar Black 1TB NA NA

The solid-state crowd is augmented by a couple of mechanical drives. WD’s Caviar Black 1TB represents the old-school hard drive camp. Seagate’s Desktop SSHD 2TB is along for the ride, as well. The SSHD combines mechanical platters with 8GB of flash cache, but like the Caviar Black, it’s really not a direct competitor to the SSDs. The mechanical and hybrid drives are meant to provide additional context for our SSD results.

If you’ve made it this far, you might enjoy a couple more shots of the BX100 and MX200.

We used the following system configuration for testing:

Processor Intel Core i5-2500K 3.3GHz
CPU cooler Thermaltake Frio
Motherboard Asus P8P67 Deluxe
Bios revision 1850
Platform hub Intel P67 Express
Platform drivers INF update
Memory size 8GB (2 DIMMs)
Memory type Corsair Vengeance DDR3 SDRAM at 1333MHz
Memory timings 9-9-9-24-1T
Audio Realtek ALC892 with 2.62 drivers
Graphics Asus EAH6670/DIS/1GD5 1GB with Catalyst 11.7 drivers
Hard drives Seagate Desktop SSHD 2TB with CC43 firmware
WD Caviar Black 1TB with 05.01D05 firmware
Adata Premier SP610 512GB with N0402C firmware
Adata Premier Pro SP920 512GB with MU01 firmware
Corsair Force Series GT 240GB with 1.3.2 firmware
Corsair Force Series LS 240GB with S8FM07.9 firmware
Corsair Neutron Series 240GB with M206 firmware
Corsair Neutron Series GTX 240GB with M206 firmware
Corsair Neutron Series XT 240GB with SAFC00.e firmware
Crucial MX100 256GB with MU01 firmware
Crucial MX100 512GB with MU01 firmware
Crucial M500 240GB with MU03 firmware
Crucial M500 480GB with MU03 firmware
Crucial M500 960GB with MU03 firmware
Crucial M550 256GB with MU01 firmware
Crucial M550 1TB with MU01 firmware
Crucial BX100 250GB with MU01 firmware
Crucial BX100 500GB with MU01 firmware
Crucial MX200 250GB with MU01 firmware
Crucial MX200 500GB with MU01 firmware
Intel 335 Series 240GB with 335s firmware
Intel 520 Series 240GB with 400i firmware
Intel 730 Series 480GB with L2010400 firmware
OCZ Vector 150 256GB with 1.1 firmware
OCZ Vertex 450 256GB with 1.0 firmware
OCZ Vertex 460 240GB with 1.0 firmware
OCZ ARC 100 240GB with 1.0 firmware
Micron M600 256GB with E100 firmware
Micron M600 1TB with E100 firmware
SanDisk Extreme II 240GB with R1131
Samsung 830 Series 256GB with CXM03B1Q firmware
Samsung 840 Series 250GB with DXT07B0Q firmware
Samsung 840 EVO 250GB with EXT0AB0Q firmware
Samsung 840 EVO 500GB with EXT0AB0Q firmware
Samsung 840 EVO 1TB with EXT0AB0Q firmware
Samsung 840 Pro Series 256GB with DXM04B0Q firmware
Samsung 850 EVO 250GB with EMT01B6Q firmware
Samsung 850 EVO 1TB with EMT01B6Q firmware
Samsung 850 Pro 512GB with EXM01B6Q firmware
Seagate 600 SSD 240GB with B660 firmware
Power supply Corsair Professional Series Gold AX650W
OS Windows 7 Ultimate x64

Thanks to Asus for providing the systems’ motherboards and graphics cards, Intel for the CPUs, Corsair for the memory and PSUs, Thermaltake for the CPU coolers, and Western Digital for the Caviar Black 1TB system drives.

We used the following versions of our test applications:

Some further notes on our test methods:

  • To ensure consistent and repeatable results, the SSDs were secure-erased before almost every component of our test suite. Some of our tests then put the SSDs into a used state before the workload begins, which better exposes each drive’s long-term performance characteristics. In other tests, like DriveBench and FileBench, we induce a used state before testing. In all cases, the SSDs were in the same state before each test, ensuring an even playing field. The performance of mechanical hard drives is much more consistent between factory fresh and used states, so we skipped wiping the HDDs before each test—mechanical drives take forever to secure erase.

  • We run all our tests at least three times and report the median of the results. We’ve found IOMeter performance can fall off with SSDs after the first couple of runs, so we use five runs for solid-state drives and throw out the first two.

  • Steps have been taken to ensure that Sandy Bridge’s power-saving features don’t taint any of our results. All of the CPU’s low-power states have been disabled, effectively pegging the 2500K at 3.3GHz. Transitioning in and out of different power states can affect the performance of storage benchmarks, especially when dealing with short burst transfers.

The test systems’ Windows desktop was set at 1280×1024 in 32-bit color at a 75Hz screen refresh rate. Most of the tests and methods we employed are publicly available and reproducible. If you have questions about our methods, hit our forums to talk with us about them.


Before we weigh in with our final verdict, we’ll bust out a few of our famous value scatter plots. These plots use an overall performance score compared against a common baseline. This score is based on a subset of the performance data from our full suite, with CrystalDiskMark’s sequential transfer rates substituted for older HD Tune scores. (More details about how we calculate overall performance are available here.)

We’ve mashed up the overall scores with per-gigabyte prices from Newegg. The best solutions will gravitate toward the upper left corner of the plot, which signifies high performance and low prices.

Solid-state and mechanical storage have vastly different performance and prices, and those disparities make it impossible to squeeze in labels for all the drives in the full plot. Click the buttons below the plot to switch between all the drives and a cropped look at just the SSDs. To make that plot easier to read, we’ve trimmed the axes and removed some older, less relevant drives with inflated prices.

Ok, so the SSD-only plot is still kind of a mess. But that’s unavoidable, because an awful lot of drives are squeezed into a relatively narrow performance band. The price differences are much larger than the overall performance deltas.

Our price-performance mashup does make a few things clear, though. The BX100 500GB is basically as fast as its MX200 counterpart, but it’s a lot cheaper to buy. The BX100 250GB costs substantially less than the equivalent MX200, too, and it’s even faster overall. More importantly, perhaps, both of the new 250GB units have much better overall performance than the older MX100 and M550 variants they ostensibly replace.

Although the scatters show the BX100 upstaging the MX200, they don’t tell the whole story. The MX200 provides hardware acceleration for full-disk encryption, an important feature that’s absent from the BX100. It also has more robust protection against NAND failures, much higher endurance ratings for higher capacities, and cloning software that’s useful for upgrading existing systems. Those extras may not appeal to everyone, but they add undeniable value that isn’t captured by our plot.

If you don’t need any of that extra stuff, the BX100 is a heck of a drive for the money. The 250GB version’s performance characteristics are especially appealing, and the four-channel Silicon Motion controller looks like an especially good fit for that capacity.

The MX200 isn’t as much of a clear-cut winner, in part because of the deep selection of fast, full-featured drives in the same price range. The fact that the 250GB variant’s SLC caching only works well in certain scenarios further muddies the waters. Still, the 500GB model is an excellent all-rounder that I’d recommend in a heartbeat. Given the issues plaguing some of Samsung’s TLC-based SSDs, I’d take the MX200 over any EVO right now.

0 responses to “Crucial’s BX100 and MX200 solid-state drives reviewed

  1. This is backed up by the service times over X ms data that TR provides. It’s made me rather *meh* about Crucial SSDs for some time…those latency hitches would be more noticeable and outweigh some extra MB/s in transfer speed.

  2. I am liking its extremely low-power characteristics. I can provide hard data now for some customers, convincing them that going cheaper may not always be a step backwards in all cases. A little extra battery savings here & there (when it comes to notebooks, at least) is for some folks a huge blessing.

  3. I concur. A full-blown AES-256 bit test with something like WinMagic’s SecureDoc software doing the encryption would be awesome to see! May the best SSD win.

  4. Having had both M500s and M550s (and 3 M4’s as well), I recommend using the M550s for the more latency-critical stuff, e.g., O/S drives, or games you really like. The M500s were noticeably slower for me, and would occasionally seem to freeze-up for a few milliseconds once in a while. Other than that, over about a dozen drives , they’ve been perfect (knock-wood). An old 128GB M4 still amazes me – stuffed-full in an older 16GB DRAM machine that pages a lot and hybrid-hibernates once or twice per day.

    YMMV, but for me, SSDs have been way more reliable than mechanicals. Though I do keep regular backups (speaking of which – time to run my backups).

  5. The last two SSDs I bought were older model (M500 and M550) Crucials. They were on crazy clearance sales and that was all I needed. I am slowly replacing the spinning discs in the house in all the desktops and based on my limited testing it should be giving me at least an extra year of use for 4-year-old boxes. A few hundred bucks for RAM and SSD is really easy considering I am still running Win7 on most of them.

  6. Eh. I don’t think I’d take a known flawed product because a new one MIGHT be.

  7. Thanks for the information! Better trim handling is always a good thing especially because TRIM commands are blocking IIRC. It must have been mostly a stability update then.

  8. FWIW I bought the 512GB M550 when they were clearing inventory; it still came with MU01. After testing I upgraded to MU02 and couldn’t find any significant difference in performance, the only big difference I could find was its (improved) handling of queued TRIM under linux.

  9. As if the BX100 wasn’t awesome enough, it’s now a good bit cheaper on the egg than it was at the time of the review (well, at least the 250 and 500GB. 1TB more expensive…):

    250GB -> $100 (down from 110 in review)
    500GB -> $180 (down from 190 in review)
    1TB -> $390 (up from 375 in review)

    Thinking about pulling the trigger on that 500GB…

  10. A side question on the test: which firmware was used for the M550? It seems that most of those drives were shipped with the MU01 firmware but recently they made a new release (MU02, available as an update for existing drives) and apparently some drives shipped with it.

  11. > Given the issues plaguing some of Samsung’s TLC-based SSDs, I’d take the MX200 over any EVO right now.

    Various sayings about devils known vs unknown come to mind.

  12. Same controller is oversimplifying it. Go to Anandtech Bench and compare the two – they do not perform the same.

  13. Same Marvell 88SS9187 controller as so many others, seems like a waste of Geoff’s time. There’s already an M500 480GB that should match Sandisks’s 480GB version, and an MX100 512GB (with less over provisioning) in there so just use those as a reference.

  14. [quote<] It will double your chance that both your main drive and backup [/quote<] What the heck are you talking about? RAID0 is striping without parity. If ANY drive dies in a RAID0 array, you lose everything from the array. I think you're thinking of RAID1 aka mirroring.

  15. Looks like [url=,3613-5.html<]Tom's Hardware[/url<] already did that test with a half dozen Intel S3500s. They found the limiting factor to be the DMI interface between the chipset and the CPU. It seems the intel RAID controller effectively tops out at ~1600MBps.

  16. For practical purposes, you’d want to back up any important files. I’m just curious how well it’d perform. Specifically if the AHCI controller can outpace a PCIe card, given enough disks. I wouldn’t be surprised if there is something in the controller that maxes out at 6Gbps total, instead of per port.

  17. It will double your chance that both your main drive and backup go down at the same time but that’s so tiny to begin with it’s not worth worrying about.

    The absolute increase to downtime and costs is much bigger but if it’s cheaper overall the cost could well be worth it and plenty of people can live with a bit of downtime.

  18. PC PER did a bit of a look at the caching,but there’s so much info we don’t have….
    [url<][/url<] The PC Mark 8 tests i was referring to were on 500 GB and 1TB drives-which are not meant to have SLC caching enabled. [url<][/url<] And it don't seem to effect Sandisk Ultra 2 or Samsung 850 Evo...... MX200 are the only drives I've seen NOT start to recover in the recovery phase of that test.

  19. Except for the fact you are running RAID0 and have a much higher chance of data loss. As with most things PC, one bigger/faster/higher res (insert component) rules over multiples in my book.

  20. And that is exactly why I wish they would stop leaving the 120GB versions out! Because most of the time, we are just trying to improve PC boot speeds, that’s it! Or maybe add a 120GB SSD to help out a Video / Photo Editing machine with reads and writes. I’ve said it before and will say it again… please give us a 120GB Value SSD Roundup TR! Because some of us, even at 99 bucks the 240 / 250gb drives may be out of our budgets for certain builds.

    I will say though JJAP, that the EVO 840 / 850 120GB SSD’s are the fastest while the OCZ Arc 120GB offers the best performance for a cheaper price.

  21. The answer is right there in the graph of the effect of the SLC caching: [url<][/url<] Indeed, once it gets to steady-state the writes are~75MB/s. It's why I don't like the idea of these caching schemes, at least not for the drives enthusiasts will buy. Even for smaller drives, although it's nice to reduce the impact of reduced die parallelism and it won't often come up in real use, it still seems wrong to have the potential for such slow speeds. I would like to see some more in-depth investigation of these caching schemes, and when they are triggered. An HDTune sequential write graph isn't particularly real-world.

  22. [quote=”thedosbox”<] Given it effectively creates a web server on your desktop, I hope anyone running this is using a firewall.[/quote<] You really don't need a firewall if all it's doing is listening on -- if an attacker already has access to loopback, you're pretty much dead anyway.

  23. “The BX100 boasts faster sequential read speed ratings than the pricier MX200”

    535 < 555. Or am I missing something?

  24. It seems like an odd decision on the face of it, but without implying I agree:

    – (Theoretically) they won’t have to update the UI for other platforms (Mac OSX, Linux, new versions of Windows)
    – Web developers are cheaper than native code developers (i.e. hiring developers with OSX experience is harder and more expensive)
    – Web-apps are the new hotness for most companies (they fit with cloud/SaaS thinking).

  25. Had my eye on a Transcend 370 for a while-basically same as BX100,and $40 cheaper.
    Crucial penalizes us with prices here in Aus.

    Checking other reviews MX200 seems to struggle to recover in PC Mark 8 Consistency test.
    Can’t seem to get above 75 MB in recovery stage………
    Perhaps Crucial is deferring garbage collection for some reason……….
    Most of us will never have our drives get to that state-but it’s still a concern…………………….

  26. Why in God’s name would they write an SSD monitoring program that functions like that?

  27. Agreed. SSD reviews are increasingly ho-hum: price/GB continues to drop while the incremental performance differences are largely negligible for real-world consumer workloads. The only really interesting things on the horizon are the new interfaces and form factors. In the meantime, a test of an overlooked feature like whole-disk encryption would certainly spice things up.

  28. At 500GB, BX100 is the winner. At 256, Arc 100 has better price/performance. Anyone know what they would recommend for 128 (something that kept high write speeds) and 1TB (850 EVO is only $20 more than BX100)?

  29. I stocked up on M550 512GB’s a few months ago when various places were blowing out their remaining stock. I’m not sorry I did: fatter flash and still wins several tests I care about.

  30. A pity though hardware AES encryption is missing on the bx100 (the other things missing compared to mx200 are pretty understandable). I guess crucial felt the need to leave out that feature so there’s another reason to buy the mx200 (since the SM2246EN indeed could do AES / TCG OPAL)…

  31. Any one got a good guess as to how a pair of BX100’s would perform in RAID 0? I’m not even sure how the intel chipset handles RAID0 when each drive is capable of saturating it’s link. I’d be very interested in seeing some perf data on that. Better yet, how about a review of 2 or 4 of these cheap BX drives against Samsungs new SM951 PCIe drive? A quartet of these budget drives would probably give it a run for it’s money.

  32. Oh thank god. I got the 256 one to go into my new PC and it arrives today. I was afraid that I’d screwed up. Nice to see it get a good review

  33. 1 is obvious, and shown. 2 and 3 are interesting, though. But the takeaway from the article was a recommendation of the BX100, anyhow.

  34. WOW – the BX100 500GB matches the best drives – and even beats the Caviar Black on price/performance… Looks like my no-frills, low-cost, high-perf main drive has arrived 🙂

  35. Benchmarks comparing performance of the two drives in a whole disk encryption scenario would be awesome.

    I have Intel or Crucial SSDs in every machine I use regularly, and I don’t see any reason for that to change based on these results.

  36. And since I have no plans to buy this product any time soon, it is not likely to run into any memory issues like the Samsung 840 evo or the GTX 970 that I purchased in December.

  37. Agreed. I’ve been buying Crucial drives primarily with the M500 and MX100 being the main ones. Even though they show some bad results in some tests and are at the bottom of the performance scatter, they are still “good enough” and easy to justify for the price. The BX100 will probably be the next ones I buy unless I need some M.2 ones for laptops.

    I would still get a Samsung 850Pro or Intel 730 if I was buying for a high-end processing system or something though. Not high-end as in a “gaming” system but an actual data processing system. Primarily for the warranty and endurance. But also for that extra performance. Especially if I might need to run some database stuff on them where you might actually see some of the higher queue depth and IOPs help out.

  38. Wow, the BX100 looks incredible. Seems like the Mario of SSDs– decently fast, decently priced, and decently low-power.

  39. [quote<] Storage Executive is a surprisingly bulky 150MB download for something that runs in a web browser. [/quote<] That's because it includes an entire Java Runtime Environment (JRE) - one that was over nine months old (and vulnerable) when the original version of Storage Executive was released. Given it effectively creates a web server on your desktop, I hope anyone running this is using a firewall.

  40. Exactly my thoughts as well. First, it was Intel cuz it was my first. Then Samsung cuz they were rockin’. The last two buys have been Crucial cuz they are cheap and up there with the big boys. I think I stay away from Samsung in the meantime until they can prove their worth.

  41. The scatter plot is true proof that “premium” SSD’s aren’t even worth considering for the average user. In the TR battery of tests, the difference between the BX100, the MX200 and the crazy-expensive 850 pro appears to be, well, negligible – at less than 5%

    I’ll probably pick up a 1TB BX100 when I finally run out of space on my Samsung 840…

  42. Niggle: I’m seeing 12 colored data points on the “All Drives” scatterplot but 9 on “SSDs Only”?
    They look like they’d be in range of both.

  43. I want to bring to the attention of public, PCPerspective’s findings about the behavior of Dynamic Write Acceleration @ [url<][/url<] tl;dr 1) Write speed absolutely sucks when switching between SLC and MLC modes. 2) 512 and 1024 GB versions of M600 (OEM variant of MX200) exhibit DWA like characteristics even though they aren't supposed to have it. 3) MX100, M550 and M600 (OEM variant of MX200) exhibit read speed reductions in certain scenarios. This behavior is not seen on BX100.