I dont use molex

13 amd radeon 570
2x evga g2 1600w (gpu + risers powered directly from vga slots on psu)
Pentium g4560
4gb ram
Win 10

Currently hashing 30.2 mh/s on each gpu.
Power draw from the wall: 1520W 220V

OC directly in claymore
Clocks/volt 1150/0850 2150/0850

2 more rigs coming up this weekend.
It is very stable. Mining for a week without issues.