Cheers for the responses guys.
Yea both boards won't recognize the 7850 and both boards recognize the 6950. And yes I made sure that the card is pushed in and latched properly and tried all the different PCI-E power connectors
It just perplexes me that one graphics card works while the other doesn't and yet the one that doesn't work, does work on a different motherboard. All pieces are functioning as they should individually but when the GA-Z77-D3H is paired with the 7850 problems occur.
I think I'll look for a bios update and see if that helps at all.