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I thought my GPU O/C was stable

That PSU can pull over 1Kw from the wall, i should also add your CPU overclock would add far less than your GPU overclocks in terms of wattage required, especially since you're also overvolting the cards :)

If you think it's your PSU, have you got another to test? Or at least add to the bottom card to take that out the equation.
 
Before you test your CPU and RAM OC it might save you some time to check in Event Viewer for any irregularities like WHEA or 0x000... or "Display Driver..." errors
 
Just re-ran Prime95 and it crashed out near enough straight away, went to bios and I realised some of my settings for my CPU O/C are missing since I updated my bios. I think this is what is causing my problem the whole time, just checked cpu temps in prime95 and they where well high, into the 90s, this was never the case.
Checked my Noctua and its dusted right up, going to clean tomorrow and resit the heatsink with some new cpu paste.

Hopefully this should fix it, will report back, thanks to every-one that posted in here helping me out, I would never have thought it was my CPU which I spent good time on a year ago getting stable. :-)
 
If your computer is prime95 stable.. that doesn't mean that it is 100% stable, prime95 is a good test.. but not the ultimate test.

My CPU can run prime95 @4.5ghz at 1.26V for more than 24 hours, I can even run games with that but it freezes my IE when watching videos or makes my video's driver stop working, if I change to 1.27V it runs fine, so I'm using 1.28V to be safer.
 
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