A crash here or there could be a driver issue. Broad and repetitive crashing is considerably more likely to be a systemic problem, especially with an inexotic configuration such as yours. Just odds.
I had a nice long OP comment that gave the extent of the issue but the display driver crashed and I lost it all. From the start there was a webcam+USB hub that crashed the computer from the display driver, never an issue with my GTX460
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Might also be a 14.1 beta?
Run tool. Reboot. Install driver. Reboot.
Don't skip any of my instructions.