I can tell you my setup but your not going to be able to help. It's SMOS causing the problems
Intel g4400
MSI Z170A G45
Corsair Vengeance LPX DDR4 3000 4 gb
Kingston 16gb USB
6 - MSI GTX 1070 Gaming X
Corsair AX 1200i
Antec Quattro 1000
6 - powered usb risers Ver 006C
1. set ur desired power limit 1st, nvidia oc depends on that (if u had good cooling maybe 150watt for ZEC mining)
2. if it can run stable, start adding value to gpu core.. start with 100
3. what miner did u use, and what variable did u add
and smos is not the problem, i have using it on nv and amd rigs
the only problem i had is, smos doesnt detect my RX VEGA rigs LOL