I just swapped up to a i7-7700k. Using the exact same box and cooling
with upgraded z270 MOBO of the same manufacturer, I'm finding the conventional wisdom to be true. Namely, that the 7700k is a hotter, slightly faster 6700k.
Idle CPU and board temps are up. CPU temps are ~+5C at idle [28C-30C] -> [33C-35C] and under moderate benchmarking, the temps are up 10C or more.
I haven't yet met a single of my i7-6700k benchmarks, despite the Z270 being a better board. At the exact same MOBO settings, the 6700k delivered higher benchmarks and was much
cooler. The 7700k does run well at 49.5 GHZ and is more stable @5GHZ, but at this speed, heat is the primary concern. I'll have to take a harder look into mobo optimization to get me back to 6700k performance.
The i7-6700k is clearly
the better deal for those without large cooling reserves.