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At what resolution is it dipping below 40 FPS? 30% GPU sounds like it's a driver problem still, it does not look like a cpu problem you have a good enough cpu.
1366x768 res. shouldn't the 7970 be able to handle ultra @ 60fps? I'm thinking its a CPU problem man
My monitor only supports 1366x768 or lower..and 8gb corsair vengeance. But the 7970 is way better then the 570!Just for the fun of it try 1920X1080
I was just running BF3 and with my GTX 570 the lowest it would go was 40FPS with 60 people on the largest maps set to ultra 1600X1200.
Glad it helped.
At that resolution you'll be more CPU bound then GPU.
However, it doesn't make sense that you don't have problems with Nvidia graphics card. That shouldn't make a difference.
Do you still have your CPU overclocked?