They are both about the same. The DIrectx 11 support is essentially worthless for gaming because I remember the 5670 was a low end early DX11 card. So you really can't play games on it in DX11 mode since it's just not powerful enough. In DX9 then the 9800GT is a match for it. I'd look for a 5850 if you're looking for something of that vintage and relatively inexpensive.