a 3d app hanging doesnt mean a dead card, could be driver's, user error, power supply etc etc.
If you have a crappy ps or some other issue then worry about that first.
This thread makes me laugh every time i see it
And how did we go from 2 dead cards to 5 i only see 2 listed in here...
And this is the only dead one ive heard of from all the forums i read.