I know the 4670 was around the same performance as the 9600GSO/8800GS. The 5570 is faster then the 4670, so the 5670 must be faster then the 4670 as well. I always assumed (oops!) that it was around the speed of the 9800GT. Turns out its a bit slower. They are very close at 1680x1050, but the 9800GT is just a touch faster from what I've seen in reviews. It does still lack DX11, eyefinity, uses more power, etc. I guess you'll have to chose which you want. (or just get the 5750 and have both.)