The GPU doesn't matter much for Dolphin, so long as it supports pixel shaders and it is decently fast. There wouldn't be a performance difference between a 4870 and a 5770 in Dolphin.
CPU choice is what matters most in emulation. Between the 750 and 965, I'd say the i5 750 would likely edge out the Phenom II X4 965 by a bit, though I don't think the difference in performance is very tangible.
CPU choice is what matters most in emulation. Between the 750 and 965, I'd say the i5 750 would likely edge out the Phenom II X4 965 by a bit, though I don't think the difference in performance is very tangible.