We published our Haswell-E discussion video today, but ran through a lot of technical stuff in the 40 minutes we spent talking about desktop PC technologies. I wanted to distill some of that information for you with the salient takeaways from my time building and testing this new system. It's not a system I expect most (or even any) of you to actually buy and build yourself, but testing and researching these components gave me a better understanding of the state of the high-end PC market, which uses new tech like DDR4 and PCI-e storage that will hopefully trickle down into the mid-range over the next year.
I'm going to run through each component of this build, and make some prescriptions for practical alternatives in each category.
Haswell-E Core i7 5960X CPU
This is the piece that kicked off the entire build. Haswell-E is Intel's top-of-the-line desktop processor series. With each generational release (Nehalem, Sandy Bridge, Ivy Bridge, Haswell), Intel segments its desktop CPU releases. There's the low-end i3 processors that only have two cores and consume very low power, the mid-range i5 processors that have four cores but no hyperthreading, and i7 processors that have four cores and hyperthreading for 8 threads of computing--only useful if applications support it. In the i5 and i7 line, Intel also has 'K' moniker processors that are unlocked, meaning you can overclock them by bumping up the base clock or multiplier ratio in your motherboard BIOS. On the ultra high-end Intel has i7 "Extreme" processors that add even more cores. That's what Haswell-E is.
Past Extreme processors for Intel topped out at 6 cores (hexacore). In the past this was sometimes done by disabling two cores on an 8-core server part, which also took away some L3 cache available. Haswell-E is Intel's first desktop CPU with eight actual cores (in the high end model), meaning 16 threads with hyperthreading. It also has a whopping 20MB of L3 cache.
There are actually three Haswell-E processors, each speced slightly differently. The i7 5960X I tested is the only model with eight cores. The i7 5930K and 5820K are both six core parts, and significantly cheaper. The pricing for the three models from high to low are pegged at $1000, $580, and $390, respectively. But you'll also note that the two six core parts are actually clocked higher than the 5960X. That's because the additional two cores makes this a really power hungry and hot chip. Intel specs it at 3GHz with a 3.5Ghz Turbo (auto clocking up to hit the 140W TDP), but the other two clock in at 3.5GHz and 3.3GHz respectively. The other difference between the two lower ends is how any lanes of PCIe they support. 40 for the high end, 28 for the $390 part. 28 PCIe lanes is actually plenty for most people, even if they're running dual-GPU setups. 40 lanes is only really needed for tri-SLI or future-proofing with thunderbolt and PCIe storage like SATA Express.
If you're building a Haswell-E system, I would recommend the $390 i7 5820K, clocked at 3.3GHz. This chip will comfortably and easily overclock past 4GHz as long as you have a decent cooler.