do you ever plan to sli/crossfire, if so the 7850 will have less problems with the psu to attempt to do so(due to lower power consumption, newer being in the market for a bit more longer and uses 1 6 pin). and if you are very pennypinching on fps, the 7850 allows the barely used pci-e 3.0 to work. though the 570 will be a tad faster in a single card build.