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JustAnEngineer
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PCIe 4.0 boosts SSD sequential performance

Fri Jul 12, 2019 5:21 pm

That's a much larger improvement than I expected to see for the first available PCIe 4.0 hardware. Look at those sequential read and write speeds.
https://www.techpowerup.com/review/pci- ... yzen-3000/
W1zzard wrote:
While the synthetic numbers are truly impressive for PCI-Express 4.0, showing over 5 GB/s actual transfer rates, which is 43% faster than the same SSD running at PCI-Express 3.0, the actual real-life gains are small. Averaged across our test suite, we only see a 1% improvement, nothing you'd ever notice in real-life. It seems the problem is not with sequential transfer rates, which are high enough, but what matters in real applications—random IO.
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chuckula
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Re: PCIe 4.0 boosts SSD sequential performance

Fri Jul 12, 2019 8:01 pm

In other news: Water is wet.

But what did it do for random read/writes [yes that's rhetorical since your quote answers the question]?
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Re: PCIe 4.0 boosts SSD sequential performance

Fri Jul 12, 2019 10:17 pm

Consumer workloads are rarely limited in sequential IO. I'm super excited for PCIe 4.0 on servers with Rome, though. :)
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JustAnEngineer
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Re: PCIe 4.0 boosts SSD sequential performance

Sun Jul 14, 2019 11:27 pm

https://www.techpowerup.com/257380/asus ... therboards
btarunr wrote:
AMD isn't too happy with ASUS marketing PCIe gen 4.0 support on its 400-series motherboards, and is reportedly trying to block it in updates to the AGESA microcode. Our recommendation - if your updated ASUS 400-series motherboard is running PCIe gen 4.0, don't update its BIOS.
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Re: PCIe 4.0 boosts SSD sequential performance

Mon Jul 15, 2019 6:53 am

For the 3 people that would take advantage of it.
 
The Egg
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Re: PCIe 4.0 boosts SSD sequential performance

Mon Jul 15, 2019 8:11 am

Great. As if inexperienced builders aren't hyper-focused on their PCIe version number enough as it is, now they have a legit benchmark to glom-onto.
 
jihadjoe
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Re: PCIe 4.0 boosts SSD sequential performance

Tue Jul 16, 2019 6:44 am

Even good old PCIe3 NVMe is largely useless for home systems. I remember seeing a side by side comparison video of boot and various game load times featuring then super-spiffy Samsung 960 NVMe vs a Crucial SATA SSD. There was really no difference, and in one or two cases the Crucial might have even pipped the NVMe drive. 500MB/s is plenty for office and games.
 
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Re: PCIe 4.0 boosts SSD sequential performance

Tue Jul 16, 2019 7:58 am

Evidently these first-gen PCI-E 4.0 controllers are just the PCI-E 3.0 controllers with the PHY swapped out.
 
The Egg
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Re: PCIe 4.0 boosts SSD sequential performance

Tue Jul 16, 2019 8:00 am

jihadjoe wrote:
Even good old PCIe3 NVMe is largely useless for home systems. I remember seeing a side by side comparison video of boot and various game load times featuring then super-spiffy Samsung 960 NVMe vs a Crucial SATA SSD. There was really no difference, and in one or two cases the Crucial might have even pipped the NVMe drive. 500MB/s is plenty for office and games.

NVMe does have some improvements over SATA beyond just throughput.

I recently got my dad a cheap NVMe drive with Toshiba NAND and the newish Phison E12 controller. Installed into his old Phenom II system using a $15 PCIe adapter. He reported tremendous improvement over his old SATA drive (which admittedly was a very old 120GB model, and a poor example for performance comparison). You could probably find some synthetic benchmarks which show PCIe 2.0 is "badly limiting" his max sequential speed, but 98% of the time that's not going to come into play, and he's still reaping the vast majority of the benefits over 2.0 (which I believe tops out around 1600MB/s real-world).

Also, I can't speak to there being BIOS support in every system, but in this particular instance it was very easy (an inexpensive) to add M.2 capability. In systems which already have M.2, it should be a cakewalk to add additional ports when needed. All good stuff.
 
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Re: PCIe 4.0 boosts SSD sequential performance

Wed Aug 07, 2019 3:23 pm

And here’s the patch to disable PCIe 4.0 on older chipsets..,.
https://www.techpowerup.com/258044/amds ... therboards
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Re: PCIe 4.0 boosts SSD sequential performance

Wed Aug 07, 2019 4:13 pm

AMD is just trying to prevent people from running into data corruption/stability issues when attempting to force PCIE 4.0 mode on older pre-5xx era boards. There's a good chance some of them don't have proper tracings and laying that is necessary for reliable PCIe 4.0 mode. PCIe 4.0 is really just PCIe 3.0 operating at double of the clockspeed.
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JustAnEngineer
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Re: PCIe 4.0 boosts SSD sequential performance

Mon Aug 12, 2019 6:24 pm

8 GB/s for the new Sammy enterprise PCIe 4.0 SSDs:
https://hothardware.com/news/samsung-pm ... reads-32tb
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