Ok, I have figured out what was causing my problem. It was the new card the Gigabyte sent me. For some reason, it won't work with the F62 BIOS, which is what my other 3 cards have and I can get 730khs with. When I use this card in the same rig with the other 3, it drops the hash rate of every one. I think this card is defective. After flashing it to the F62 BIOS, I get crashes and graphical glitches. It has the same PCB as the other cards and is otherwise identical. Has anyone else heard of this happening?