I have this combination and it doesnt work good at all sadly. Only when nothing is overclocked does it seem to run normally. I overclocked it at 4.7ghz seemingly without a problem, then a few restarts later and it refused to even boot at that setting. Since then no matter what I've done I cant get it to work at that setting again, neither can I overclock it without using Turbo mode cause then it refuses to boot. I tried clearing CMOS, flashing different Bios and tried just about every single setting. Often it copies the backup bios back aswell when it fails to boot, but sometimes it just gets absolutely stuck and the only way to get it to boot again is to clear CMOS.
I cant recommend this card nor any other P67 gigabyte cards from what I read until they sort out their Bios. I feel like a test pilot for an alfa version. This is just unacceptable. I have often had new chipset releases and never before I have seen such unstable motherboards at release. Gigabyte doesnt seem to be only brand that has problem with Sandy Bridge, but I really wanna see em sort out the Bios asap else I'll return this and get another brand.