I don't know, I haven't tried games yet but 2-3 times the driver was being continously restored, in particular 1 time there were lot of glitches on the screen. And if I open a program too early after system startup, the entire PC freezes. May these things mean a malfunction of my card?
By the way, when I was using the GTX 260 it was powered by two 6 pin pci-e cables, while the ATI has one 6 pin slot and one 8 pin slot for the auxiliary powering, to which i've connected the same cables, therefore connecting the second 6 pin cable to the 8 pin slot.
Doesn't sound too promising...
Two 6-pin(2x75W) should be enough for default(1.1688V), one 6-pin(75W) and one 8-pin(150W) would come in handy with some extreme voltages though...
You could try and undervoltage to 1.088V and see if that helps...
Might need EULA-tweak(
http://forums.guru3d.com/showthread.php?t=338906) for MSI Afterburner since voltage-controls are grayed out...
Or try ASUS GPU Tweak
http://ftp://ftp.asus.com.tw/pub/ASUS/vga/app/GPUTweak110.zipOr try getting an adapter to get an 8-pin...