They increased performance by 400% They are monstrous when it comes to compute my 7850 beats all the 6xxx series at math including dual gpu cards. OpenCL performance is especially epic and 7xxxx cards smash All of nvidias cards right now. Can download clbenchmark to test I think vs my card 680 wins 50% of the benchmarks so the cards definitely have different strengths. My scores are attached. GPU is @ stock speeds for the test.