I guess Dirt 3 requires the most out of GPU as far as racing games are concerned. It is the most demanding car game right? [correct me if I'm wrong]
The difference in fps is <5 fps for ultra @2560x1440 and in minimum @2560x1440 between 7870 and 7950.
And even minimum gives 60+ fps. I think my monitor can't go beyond 60+fps. I have a 520W PSU and I think I'll have to change it to 650W for 79xx cards. Whereas I can use the same 520W for 78xx cards.
I'm considering that too
PS : I don't play bf3