nvidia gtx570 vs amd hd7870?

about to upgrade system, seems 7870 is a more powerful card, but it only supports opencl which means I can’t get much out of cycles, how about viewports performance, is 7870 better (if not by much) than 570?
any benchmark I can have a look?

As for viewport - both cards are almost overkill :slight_smile:
I rarely stall my 470 and when I do it’s mostly due to other components.