Your ATI video driver and a DXdiag note are present in the dumps. Have you attached a spare power supply connector to the motherboard?
Crossfire enabled motherboards have a male molex 4-pin connector on the motherboard to allow a 4-pin molex female connector from the power supply to be attached when crossfire is enabled. This motherboard connector supplies more current to the video circuits when crossfire is enabled
You don't have that 4-pin connector but you do have an 8-pin CPU aux connector. Are all 8 pins used, or just 4?
So have the BSOD's stopped?