The big changes
The cores on Haswell-E processors share up to 20MB of L3 cache and are the first consumer desktop CPUs to support DDR4/2133 memory, providing four memory channels where Intel's most recent CPUs support only two channels to DDR3 memory (at speeds up to 1866MHz). While some boutique PC builders are touting the benefits of this increase in bandwidth, an Intel spokesperson told me in a briefing earlier this week that in these early days, DDR4's primary benefit will be reduced power draw.
That gave me a chuckle, because Intel otherwise threw caution to the wind in terms of thermal design power; after all, you'll never see one of these chips in a notebook.
Each of the three new Extreme Edition processors has a TDP of 140 watts. That's 10 watts higher than its Ivy Bridge-E parts, and it's considerably higher than Intel's other unlocked Haswell processors — the Core i7-4790K (code-named Devil's Canyon) and the Core i5-4690K — which have TDPs of just 88 watts. Intel's mainstream Core i7 desktop processors, meanwhile, have TDPs as low as 35 watts.
In addition to its DDR4 support, Intel's X99 chipset provides up to six USB 3.0 ports, eight USB 2.0 ports, eight PCIe 3.0 lanes, and 10 SATA 6Gbps ports (Intel's X79 chipset supports six SATA ports, but only two are the faster 6Gbps variety). Support for Intel's Rapid Storage Technology 13.1 is optional. Intel describes the X99 chipset as "Thunderbolt Capable," but X99 motherboards must be "Thunderbolt Ready," meaning they have a connector for a Thunderbolt 2 add-in card.
Thunderbolt 2 offers twice the bidirectional throughput of the original Thunderbolt spec — 20Gbps — and supports daisy-chaining up to six devices on a single port. Who needs that much throughput? Content creators editing 4K video, rendering 3D images, or developing games. Thunderbolt 2 is overkill for most consumers; but since it comes in the form of an add-in card, you won't pay for it unless you need it.
As I said at the beginning, Haswell-E is aimed at gamers, content creators, and unabashed PC enthusiasts. Intel claims the Core i7-5960X is up to 20-percent faster at editing 4K video, 32-percent faster rendering 3D graphics, and 14-percent faster processing game physics and AI. Intel also claims that Haswell-E's increased core and thread counts enable its best processor to convert 4K video to 1080p (using Handbrake), 34-percent faster than its six-core Core i7-4960X (Ivy Bridge-E), and 69-percent faster than its quad-core Core i7-4790K (Haswell).
Most popular content-creation programs — including Adobe Photoshop and Premiere Pro, Sony Vegas Pro, and Cakewalk Sonar — are multi-threaded and can take full advantage of the multiple cores and processor threads Intel's Extreme-series processors deliver. Games will benefit somewhat less, and this class of CPU is complete overkill for productivity apps and media playback. But speed junkies are sure to be pleased.
Intel provided us with a Core i7-5960X so we could vet these claims; unfortunately, we didn't get a compatible motherboard in time to publish benchmarks. I'll update this story with that information soon.
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