Ok, Prime95 Small FFTs- Test ran 24 Hours, 1 Minutes - 0 Errors, 0 Warnings. The average temperature I saw was probably ~50C and highest 53C.
I rebooted and ran 3DMark06 without problems, and got (GTS 250 Vid Card)
SM 2.0: 7024
SM 3.0: 6828
About 1.4k higher than before OC.
Guess it's stable for gaming/everyday use now huh?