I got gigabyte 7950 and i put your bios. Cannot run claymoreminer 4.0 at 1100 mhz core and 1575 mhz mem because miner says invalid data.. I change voltage to 1.200V and 1050mhz core 1450mhz  mem and now it runs 75-79sol without errors. I dont know if more voltage would change anything..