recently, my gpu has been acting up, during fairly short gaming sessions (2 - 4 hours)f the screen would go black and the gpu fan would kick up to 100 percent. i would reboot, and everything would return to normal, until it did it again the next gaming session. the final time, after about 6 or 7 incedents, after reboot it continued to run at 100 percent and i still had no video. i took the card out and placed it into a different system, and moved my psu into it to power the card, and it runs just fine. ideas? i'm assuming its the motherboard, but i cant really be sure. any ways to troubleshoot?
msi 760gm-e51 mainboard
xfx radeon hd5850 black edition
amd phenom II x4 955 black edition
2x4gb g.skill ripjaws ddr3 1333
corsair hx650 psu