Are you sure it aint the power supply?
the Apevia PSUs are very poor quality in a flashy case...everyone thats tested one ended up in a flame....
I have one and i wouldnt even power my AM2 rig with it let alone yours....which is better than mine...
other than that as long as its passed at least 8 hours of Memtest v1.70 on test #5 and a minimum of 8-10 hours of Orthos for dual cores or multi-threaded Prime I would be inclined to think driver issue....try rolling the driver back...