Why cant I overclock my 4870X2?

[danielanthony]

Hello,

I've got my 4870X2 water cooled, so it idles at 39oc on both GPU's. I have enabled ATI overdrive through CCC and pumped the GPU to 800Mhz and memory to 1000Mhz - it also puts these settings if I allow it to auto tune.

But, when playing a game, there are loads of artefacts, so I have to reduce the speeds back down to defaults to display the game normally again.

So what am I doing wrong? My temps are low enough that I should get to 800Mhz surely?

Thanks,

Dan

 

[danielanthony]

Fair enough, but a 50Mhz increase is only 6.5% over stock, surely these GPU's can handle more than that?

 

[danielanthony]

Ok, more volts might be needed!