weird - graphics card fixes itself?

[4everAnoob]

So i have this 9800 gt which is overheating alot (furmark 105C then throttles back to protect itself) so i put on a different cooler and at first i got all artefacting and glitches but the temp was lower. So thinking i destroyed the card i then ordered a 6870. However, now I lowered my OC slightly on my CPU (NOT GPU) and lowering vcore slightly the card has completely fixed itself
Specs:
Q6600 320 x 9 2.9 ghz
4 GB RAM
ASRock 4core1333 GLAN M (crap )
CM M520 real power modular PSU
Have I ordered that 6870 for nothing? Because I still play on 17 inch and im not planning on getting any larger until q4 this year q1 next year when HD7xxx GTX6XX is expected to be released.
TIA

 

[Red Falcon]

The mobo could have been stretched to its limit on voltages, causing the GPU to not function properly. Really sounds like the VRMs were overloaded.