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Is my PSU big enough?

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Hi,
My current setup is
Coolermaster HAF 942
ASUS Formula IV Crosshair Motherboard
AMD Phenom 1090T OC @4 Ghz
2x XFX Radeon 5870's
16GB GSkill Memory

Sometimes I get random blue screens, when the system is stressed and also when its not stressed. Also with the computer overclocked or on factory settings. The graphics cards are all on factory settings. I was wondering if these random blue screens, maybe once or twice a week, can contribute to my power supply not being big enough for my setup. I pass prime95 torture tests was i was thinking the psu is fine but im not sure its enough. I have an OCZ 750W psu that i got a deal on from a friend so thats why i initially didnt get a bigger one. Thanks.

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Power supply Master

Most likely a gpu driver errors or memory.
Have you ran Memtest86+?
There's a possibilty one of your ram module might be defective.
Run Memtest86+ one stick at a time to isolate a bad module.
Use the mobo default ram settings and run it for a reasonable amount of time.
At least 30min-1hr for each module.
http://www.memtest.org/
If your ram isn't the problem it's probably improper settings on your overclock.
Have you ran any stability programs like Prime95 for your oc?
An underpowered psu would run hot and the fan would be noticeably loud.

already did. There was a problem with one stick which was why i had a lot of blue screens a couple months ago but i got them rma'd and retested all the sticks again and they are all fine. Did a clean restore after new ram was recieved.
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Power supply Master

nickeagles416 said:
already did. There was a problem with one stick which was why i had a lot of blue screens a couple months ago but i got them rma'd and retested all the sticks again and they are all fine. Did a clean restore after new ram was recieved.

Duh! i just read you ran prime.
A 5870 idles under 30W so i can't see the psu being the problem.
But i wouldn't rule it out just yet.
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