I went from i4820K 4.7Ghz OC platform from 2013 to 8700K 5.1Ghz OC platform 2months ago. Same Samsung 950 SSD + 2xGTX 1080 in SLI
More improvement in FH2 than expected minimum FPS raised ca. 25-30fps and less microstutter
motherboard : Asus ROG Maximus X Apex (because of high quality VRM )
ram : 2x8Gb Gskill F4-3200C14-GTZR (because of easy overclockable Samsung B-die chips with low Cas latency)
PSU : Corsair RM850W
CPU cooler : Corsair H115i pro
If you want to OC cpu + ram: Make sure to get a nice AIR flow coz 8700K, Ram and gfx gets very hot
I have air intake FANS in front(bottom), Side and Bottom + air Out in : Top, back and in front(top) allmost all conncted to an old NZXT Sentry MESH Fan Controller