Last year I had 4 Gainward FX5900 Ultra's lay down on me. First one lasted 6 months, second 1 month, third 3 weeks. Fourth is in the box ready to go back to Gainward. I finally gave up and bought a x800pro. Haven't had a problem since. I have a Gainward Ti4200 that is rock solid. I don't know...
Your new card could be bad too. I have a Gainward FX5900 ultra that i have returned 4 times and is due for another trip back to Gainward. Each of the cards i got from them has been messed up one way or another.
Stupid Asus Probe. Never did like it too much. I had a a7v333 board once and it said the cpu temp was 170F all the time, when the bios and mbm said it was around 115F. Weird