I'm sorry but as I see it thus far Kaby Lake for the desktop if DOA. I'm on Haswell now and there is no way I'll consider Kaby Lake upgrade. Intel will sell millions of them in pre-built systems and mobile devices so they don't care.
Of course it's DOA. That's what happens thanks to process -> architecture -> optimization. We've already had that before, process with IVB, architecture with HSW, optimization with HSW refresh / devil's canyon. The sequence then repeats with BW/SKL/KBL. Thanks physics, you're making CPUs boring after decades of improvements and exponential $ needed to overcome you. It also doesn't help that Nehalem (stretching it..) or Sandy still feel mostly fine for daily and most demanding tasks. Put an SSD in there and you probably couldn't tell them apart from a new machine.
HSW/BW -> SKL/KBL is only worth it if you're willing to pay for
DDR4 above 3500-4000MHz to extract every drop of potential out of it. Then you get the exact same cores with a better GPU in KBL. meh for the desktop, who cares? Optimization as shown in the 7700k (in particular RichUK's as an example) only got Core to a stable 5GHz thanks to delidding, if it weren't for that he'd hit a brick wall due to temperatures. On top of that it's a single sample, is it a dud, the norm, or KBL's best? Mobile gets the efficiency improvements from optimization, we don't.
Remember the i7 9xx line getting a C0 -> D0 stepping change back then, being less of a furnace and better overclockers overall? It didn't warrant the i7 2xxx name... KBL somehow gets bumped from 6xxx to 7xxx. The only redeeming point in KBL's release is Z270 and Optane support... but then, it'll cost an arm and a leg, and a NVMe PCIe SSD is already pretty freaking amazing on its own. We've already got that. SKL and its identical refinement KBL is as of today a 1.5 years old architecture. Coffeelake gets us 6c mainstream CPUs, Cannonlake is a KBL shrink? Probably a few tweaks here and there like Broadwell. Icelake is the new architecture in 2018, and by that point we've been on SKL for about 3 years. Intel just pulled a Netburst again (2001-2006) or a Bulldozer if you will (2011-2016). Again, thanks physics and increased costs.
I think the
real SKL architecture is what HEDT is getting in Skylake-X... mainstream SKL seems watered down, always seemed mostly unimpressive vs HSW and especially BW+L4 cache. It doesn't help that Intel doesn't do architecture deep dives anymore, Skylake is more of a black box than anything else... when was the last time they disclosed any significant information to the press? Haswell? At least AMD got the decency to let the public know what makes Zen tick, more or less.
Maybe Zen makes Intel wake up somewhat, get some exciting products out instead of the tried and true formula (4c8t mainstream / HEDT overlapping) they've been doing since Nehalem. It's stale, boring. Time to get BW's cool L4 cache across the board or in some select K parts... don't you think?
http://www.anandtech.com/show/9483/intel-skylake-review-6700k-6600k-ddr4-ddr3-ipc-6th-generation
In the past Intel has historically run a 1:1 policy whereby a 1% performance gain must come at a maximum of a 1% power penalty – this was adjust to 2:1 for Broadwell, and we should assume that Skylake had similar requirements during the planning stage.
Also probably time to try other tricks that now can't be done thanks to that policy, even if it means going over 100w TDP rating again for the typical 4C8T CPU. It's not like they're gonna end up doing a Prescott or Tejas...