Anyone else try running a 7970 on the Maximus VIII Extreme? I've tried, but to no success. I have a pair of them that I ran in Crossfire on my last setup, but neither of them seem to work in either the 1st nor 3rd slots. Nothing is wrong with the motherboard nor the cards as far as know; they have both been updated to the latest versions - BIOS 907 for the Extreme and 015.021.000.003.001364 for the 7970s (which I did not realize could be upgraded to the GHz edition until I updated). The GPUs work just fine on my old system separately and Crossfired together. My old 5850 and my friend's GTX 780 both work in both slots on the Extreme, so I'm confident the PCI-E slots are not DOA. The system just does not display anything on any of the cards' outputs, but it boots just fine: I can blindly enter my username/password for Windows and it loads just fine (I have a Logitech G13 that loads apps only when the OS loads up). Power is not an issue - Corsair 1000HXi. I can see the fan spinning on both cards. Code is bF, but that's there even with the other graphics cards.
I'm currently running the 5850 and it's on its last legs. It also doesn't do well with my monitor setup anyway. Anyone have any ideas? Some weird incompatibility with the 7970s?
