I cannot change the voltage of the second GPU in crossfire. Wondering if I can do a BIOS flash or if there is a special tool to be able to do this? Or if my only option is volt modding the card (which I intend to do anyway at some point in the future)

 

Running 2x HD7950's on a giga Z97X-SF

 

http://i.imgur.com/Cw9oVyl.png

Have you tried Trixx? It might support OV on both cards. I never had issues with it for more modern CF setups.

Thanks buildzoid, I fixed the issue, it was ULPS. It didn't matter if I had it on or off when OCing one card, but it needs it disabled when OCing 2 cards.

 

Trixx v5.2.1 doesn't work with the HD 7950 (it crashed like crazy on my system) but v5.0.0 works fine. Thankfully Trixx is the only one that told me I needed to disable ULPS, works great! Voltage control is now unlocked up until 1300

 

Although the second card doesn't go very far, hits a wall at 1025MHz on the core whereas the other goes up to 1260MHz. I think I can get some more out of the worse card on its own but I haven't tried it in a long time in a single config