I have 7970's in crossfire @1200/1600 playing @ 1920x1080 but gpu usage is never a constant 99% as it is with a single card. It will be 90-98% in non intense scenes with high fps, but once the guns start blazing, the usgae lowers to 80-85 along with the fps. It especially dips in gulf of oman where it goes as low as 75-80%. and the fps goes down to a near 55-57. I have an x79 board with a 3820 @4.5. I've looked everywhere I can for a solution and reading through other forum threads it appears xfire users have well over 120fps. I was told to switch to 12.5 beta drivers which I did, but no improvement. I get 99% gou usage in benchmarks like 3dmark11 and heaven. I have a Corsair 850AX, which I believe is enough for this! Has anyone experienced this and is this normal?