bmockeg :
My 300mhz comments are in relation to the 8600k and 8400. I know exactly how turbo boost works.
Yet you believe a static bench means same disparity throughout a game, and nit pick about one small typo in a bench that shows everything. Like I said, you don't understand how the bench game works. It's mostly hype when looking only at static benches.
Earlier you were comparing the 8400 to a 8700k, claiming it's almost as close, that's why I mistook your meaning for how you were comparing turbo. Your notion that a 65w chip is going to be able to hang consistently with a 95w chip is ill conceived.
Even if it came down to only a handful of games having severe frame drops over the 3 plus years I owned a CPU, I would still every time go for the $40 more one. Such components are too important in a gaming rig to be cheaping out on.
Just the fact that the 8600k is OCable makes it a no brainer, especailly at only $40 more. He may not want to OC now, but what if he finds out it is very easy to do just by a moderate OC via mulitiplier, without even touching the BLCK? He'd be stuck without that option on an 8400.
This is a big part of what makes the two chips quite a bit different than you clam. At 4.3GHz (actually more like 4.4), I've yet to play a game where I feel my 8700k would need an OC, but I knew had I settled for the 8600k, I'd at least have done a moderate OC to make it equal a 8700k.
With a Z370 MB (which start at pretty low prices now) and the 8600k, and a very simple OC, he could easily match the performance of my 8700k rig. You'd still have only 3/4 the cache of an 8700k though, so you'd have to actually bump the speed a bit higher than that of a 8700k to compensate, maybe like 3.9GHz base. With an 8400 he's stuck in budget rig land. This is why it's a chip that doesn't belong with a high end GPU like the 1080.