http://www.overclock3d.net/reviews/g...90_vs_gtx590/4
The numbers in DX11 are amazing with regards to the minimum FPS numbers. I didn't realize there was that much of a disparity between the two, though it does jive with my experiences with lower-tier cards at similar price points.
[edit] Yeah, it's only one review. Will be interesting to see if others have the same results.