After a good 1-2 hour play of Battlefield 2, my eVGA 6800GT 256MB begins to glitch. I see screen flashes and jagged edges out of no where, while Im playing. I then exited BF2 and my system worked extremely slow, and there were color lines and glitches on my desktop. I barely shut down the computer. After restarting, I checked the temp on the card ... 63 degrees C. Is that anywhere close to normal? This never happened before... Should I consider a better heatsink/fan? Please advise. Thank you.