Nvidia SDK D3D Demos? Nvidia SDK OpenGL Demos?
I don't think SDK demos are good performance benchmarks for overall performance. They can find bottlenecks, but not predict how good something is for games.
They could show which features work in Wine / Cedega, but I think that would be unfair to Cedega, because I assume that Transgaming is putting efforts into real games, not SDK demos. And in the end, the average user plays games instead of running sdk demos all the day. So if Cedega fails in all sdk demos that doesn't make it any worse for users.