What are you powering that needs 850W?
I mean my OC'd 4790k and two OC'd 970s, H100i, 5 HDDs etc etc run fine on full load on a 750W PSU..
Watercooled 5950X | AORUS Master X570 | Asus RTX 3090 TUF Gaming OC | 64Gb RAM | 1Tb 970 Evo Plus + 2Tb 660p | etc etc