Let's keep this short and sweet. If you're building a new PC, you want an Intel CPU. Intel's 14-nm Skylake chips are the best performers on the market by almost any measure, and it's been that way for quite some time now. We won't rehash the reasons for why this is here—go read our Core i7-6700K review for all the details. Skylake chips offer small-but-welcome increases in performance over Haswell parts pretty much across the board, and the high-end Z170 chipset offers more PCI Express lanes for next-generation storage and high-speed I/O ports than Intel's 9-series boards. Given these advantages, we'd generally recommend building around a Skylake processor if possible.
While most consumers will be interested in Skylake chips, Intel's launch of its Broadwell-E CPUs is the largest change in the CPU market since we last published a System Guide. That range of chips tops out with the seriously impressive 10-core, 20-thread Core i7-6950X.
The Broadwell architecture alone is only an evolutionary improvement over Haswell before it, but Intel has compensated for the single-threaded performance gap between Broadwell and Skylake CPUs with a new technology called Turbo Boost Max 3.0, or TBM3 for short. To make this technology work, Intel finds the core with the highest performance potential on each Broadwell-E CPU die during production, and a companion Windows driver prioritizes work to run on that core. On the Core i7-6950X in our labs, that means the best-performing core on the chip can boost up to 4GHz. At those speeds, a single-threaded Broadwell-E workload (namely, Cinebench) trails a Haswell Core i7-4790K by only 6%. The Core i7-6700K is only about 3% faster than the Core i7-4790K, so if you need all of Broadwell-E's cores, you can mostly have your cake and eat it, too.
Broadwell-E's problem—if it can be called that—is that Intel has decided to establish a new pricing tier for the top-end chip in the lineup instead of pushing up the core counts for the same price, as it has in its past generations of high-end desktop CPUs. The Core i7-6950X sells for $1750 right now, a considerable jump over the eight-core, 16-thread Core i7-6900K and its $1099 price tag. For perspective, consider the fact that you can build a quite-impressive Core i7-6700K PC for just a little more than this CPU alone costs. We've never recommended the top-end Intel Extreme CPUs to begin with, and the Core i7-6900K and Core i7-6950X don't do anything to change that. Unless you're certain your workload can take advantage of all the resources the Core i7-6950X has to offer, we think most can safely forget about it.
|Intel Core i3-6100||$124.99||Intel LGA1151 motherboard|
In this price range, we think Intel’s Core i3-6100 is a great buy. Its healthy 3.7GHz clock speed should be brisk enough for most, and its Hyper-Threading support can boost performance in multithreaded tasks. It’ll also appear as a quad-core CPU to games that require one. This Core i3 is a good choice for non-gamers, too, since it has basic integrated graphics. For $125, it's hard to find anything to complain about with this chip.
We used to recommend AMD's Athlon X4 880K here, but that chip is deactivated at Newegg. Amazon suggests it has more on the way, but stock is low and prices are relatively high. The X4 880K was a good enough value when it sold for around $90, but for just $20 less than the Core i3-6100 now, it's not an appealing option. We'll be exploring a replacement for this part in our next Guide.
|Intel Core i5-6500||$204.99||Intel LGA1151 motherboard|
|Intel Core i5-6600K||$244.99||Intel LGA1151 motherboard, Z170 chipset for overclocking,
aftermarket CPU cooler
|Intel Core i7-6700K||$359.99|
Moving up to our sweet-spot picks gets builders into Intel’s quad-core CPUs. If you don’t want to get into overclocking, the Core i5-6500 looks like the Goldilocks chip in this price range. For about $205, the i5-6500 gives us 3.2GHz base and 3.6GHz turbo clocks in a trim 65W thermal envelope. The Core i5-6500 is also a great CPU for a VR-ready machine. As a warning, we aren’t as enamored of the Core i5-6400. Though it sells for $15 less than the i5-6500, the i5-6400 pays for it with a big drop in clock speeds. We don't think the step down to 2.7GHz base and 3.3GHz Turbo speeds is worth the savings.
The logical step up from the Core i5-6500 is Intel’s Core i5-6600K. This part gives us four cores running at 3.5GHz base and 3.9GHz Turbo speeds, along with an unlocked multiplier that gives overclockers free rein. From there, the beastly Core i7-6700K adds Hyper-Threading and turns the clocks all the way up to 4GHz base and 4.2GHz Turbo speeds. Overclockers are free to explore the i7-6700K's upper limits, too.
Since Intel doesn't include a stock cooler with its K-series CPUs any longer, be sure to grab an aftermarket cooler from our selections later in this guide if you're building with a Core i5-6600K or a Core i7-6700K—and make sure it's a beefy one if you're choosing the i7-6700K. Our experience with that chip has shown that it's quite the challenge to cool, even for large tower heatsinks.
If the Z170 platform doesn't offer enough PCIe lanes, memory bandwidth, or memory capacity for your needs, Intel's "Extreme" CPUs and X99 motherboards are the next step up for desktop PCs.
|Intel Core i7-6800K||$439.99||LGA2011-v3 motherboard,
quad-channel DDR4 memory kit,
discrete graphics, aftermarket cooler
|Intel Core i7-6850K||$649.99|
With the advent of Broadwell-E, we think the best CPU choice in the lineup is probably the Core i7-6850K. At a moderate premium over the Core i7-5930K, this chip offers Turbo Boost Max 3.0 support alongside six cores and 12 threads of processing power. Its 15MB of L3 cache and support for up to 128GB of DDR4-2400 RAM are nice steps up over Intel's high-end quad-core chips. As a minor bonus, this chip also runs at slightly higher clock speeds than the $1099, eight-core Core i7-6900K. Like all Broadwell-E chips, the Core i7-6850K is unlocked for easy overclocking.
If you want extra cores and threads, and you don't need all 40 of the PCIe 3.0 lanes from fancier Broadwell-E chips, the Core i7-6800K and its 28 lanes of PCIe 3.0 connectivity fill the same role the hobbled Core i7-5820K did with Haswell-E. Even considering Nvidia's move to officially support two-way SLI only with its Pascal graphics cards, the Core i7-6800K comes up a little short for folks planning multi-GPU setups. Considering that limitation, we'll continue to conditionally recommend this chip for folks who are absolutely sure they won't miss the extra lanes.
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