Yep i am running the latest drivers etc, i am not sure about the fps numbers i get but you can feel the difference between medium and low by quite a lot. Ill just run it on low for now, it looks ok still, but would rather at least have it on medium.
You're not the only one.
I've gone from a 3.5GHz 3 core, 4GB, WinXP, 5850 to a 4GHz 6 core, 8GB, Win 7, 6850. Literally NO difference!?!?
Performance on both is 'poor'. I get 60fps on high detail (great) but it often drops to 30fps (awful).
Two completely different systems, one monsters ALL games I throw at it and yet Tribes kills it not even on MAX settings.
WTF?