PSU Causing folding problems?

[Flying freak]

In the last little while iv had my monitors die on me while using the pc. The computer seems to continue to run (pump/fans/hdd definitely keep running) but there is no signal being sent to my monitors (dual monitor setup). This has happened both while i was using the pc and when I let it run unattended. Unfortunately when i get this bug all folding stops until i reboot.

pc specs:
I7 950 OC to 4.0 Ghz (Was higher but backed it off because of above problem)
Gpu : gtx 470 OC 800 Mhz
2 HDD in raid 0
PSU is a corsair 850 AX (modular/gold)

I have another 470 that I will add to the pc soon i just need to get this issue figured out. Updated drivers which did not seem to help

Any ideas? Im starting to think i might be pulling too much power? I mean in sli maybe but even single card?

Additional Comment:

Note: No blue screen or other error msg appears the screens just go black as if you ripped out the dvi cable.

[Maniac]

Considering I only pull less than 650W at the wall with my setup, which draws a lot more power than yours, I doubt your PSU is the issue....

[PatonB]

Is the 470 overclocked? if so back it off.

I'd switch the 470's aswell to see if the card is at fault.

[jimh425]

I suspect the motherboard chips are getting too hot. Try targeting fans on Northbridge and Southbridge chips.

[jmossman]

I would agree with jim,it sounds very much like a NB/SB chip overheating. Happened to me a couple times in the past. I've OCed a pair of gtx-295s which are power hogs even before cranking them up. Between them and an OCed i7-870, I was only drawing 730-750W. OCZ makes very good PSU so would give it a bit more credit than many other brands, but any PSU can fail.
Something I always recommend is a device called "kill a watt". For $25 or so it's an amazing device for reading power draw and measuring electricity useage and whatnot. http://www.google.com/products/catal...ed=0CFcQ8wIwAg

[_MtM_]

What are your power saving settings? Something might have changed with the last drivers which causes a card to go into a lower PMU state, and I seen reports from people who fail work unit's which are started when in this lower power savings mode.l

[Flying freak]

I feel very stupid. I dropped the oc on the gtx 470 and its running just fine now. I have even installed my second 470 so im folding on 2 cards. Get great ppd but i cant use the pc while its running so i can no longer fold 24/7

[PatonB]

Why can't you run the pc?

If its sluggish, ensure Aeros on.

[Flying freak]

Originally Posted by PatonB

Why can't you run the pc?

If its sluggish, ensure Aeros on.

This actually helped a lot , Thanks.

Im able to now run most of most days computer runs well with most 'normal' applications. FAH still does not play nice with more intense software like inventor/autocad/soldworks/mastercam. So i must stop it when running those.