I had and i'm still having BSOD or freeze while surfing, playing, using photoshop and sometime (rarely) doing nothing.
BSOD tipically is verified after the system slows down and the mouse pointer starts moving slowly.
In addition to this, if I save a work while the system is "telling me" that it is going to freeze, it won't be saved: i mean that it appears to be saved (and icon is present in the folder) but the file is not available after bsod.
Finally, raid disks appear to have errors when restarting after BSOD (intel Rapid Storage Technology can correct these errors).
Try using all new SATA cables connecting the HD to MB headers. Replace all of the ones you are currently using with new.