Oddly enough sound seems to be a cause of many crashes, at least in the patch notes they've been referencing it a lot. If you have a realtek chip updating the driver from realtek is abysmal, took me about 12 hours with 'wget' restarting downloads after the connection would drop. The most up to date reasonably trustable source I've found for them is http://www.techpowerup.com/downloads/Drivers/Realtek/
The latest patch is mar.30th and, for me at least it's reasonably stable, I have similar specs to you but an 8800 GTS 320mb. it's not perfectly stable but I don't get reproduceable crashes at least :) Oh, crud, ( knocks furiously on wooden desk ).
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