I am so desperate that I will donate eth if i solve this....

6x 1070, asrock h81 btc, win 10, latest nvidia drivers, claymore 9.6, 1200w PSU, Virtual set to 16 gb.
Even at stock settings , the miner crashes, sometimes directly , and sometimes after 1-2 hours.
I have tried different nvidia drivers, and even tried previous claymore versions.
Tried swapping the cards around and setting in bios gen1/gen2 ( it should work out of the box )
I have connected the 2 molex connectors on the mobo and also having 6 powered usb risers.
Only time i can get it to go a bit longer is if i have it at stock, but change the Power target to around 60% for all cards.
I have a "wattman" and it says computer is taking 650w from the wall. but thats with low Power target, otherwise it is around 900.
When it crashes, 1 card Always dissapears , both from the miner and from Afterburner ( in AB its there but cant change anything because its grayed out ) resulting in having to reset PC.
Sometimes when it crashes , my monitor that is connected to 1 of the cards also shuts down.
Most of the times i get BSOD after the crash and if that doesnt happen, the whole computer freezes up.
I really want to Think there is enough Power to drive this with 1200w.


Edit : Just Before it crashes, my mouse curser is almost unmovable. Really laggy. But both cpu and memory are far from maxed out.
My cards temp are also not capping, just around 60.

Any ideas ?