More Freezing troubles

Fun times fun times...

So basically my computers back to freezing up every few minutes...this time it only happens every few days...

It continued to Happen when I booted in safe mode and happens on both vista and windows 7.
It seemed like a memory issue to me but after testing it with momory from a few other computers it dosen't seem to keep it from happening... and my memory works fine in other computers...

This all leads me to believe it involves the motherboard and how it is handling the memory
I'm running:

AMD Phenom 9950 Quad Core @ 2.61GHz
4 gigs of Corsair Dominator PC8500 DDR2 1066MHz Memory
Windows 7 (took vista off hoping it was the problem)
ASUS Crosshair II Formula Mobo ASUS Crosshair II Formula Mobo
And no not integrated graphics...
3 x Nvidia 9800GTX+'s

Anyone else think this could be an issue and or have a much better idea?

What kind of videocard do you have? you using onbord or discrete?

It's highly unlikely it's integrated based on the quality of the other parts listed.

well still you never know, ive seen many high-end pc's in stores that never come with a videocard... specially at office depot haha. Saw one with intel core 2 quad, 8gigs of 1066 ram, a 1200watt power supply, and it was basically a gaming pc without the videocard... stupidest thing ever

did you build it or buy it pre-made? you might not have enough power to run it

Freind built it for me as I have a medical condition that will make my hands shake badly randomly...

I'd say clear/reset the CMOS/BIOS before doing anything else. Check the mobo manual for how-to.