You sure the 580 beats the 590?

[Troids]

http://www.hwcompare.com/9825/geforce-gtx-580-vs-geforce-gtx-590

vs your bench marks

http://www.videocardbenchmark.net/high_end_gpus.html

I'm pretty sure Nvidia I'snt stupid and make the 590 more expensive and perform worse, not to metion it's the 580 vs their 590.

[mtghack]

Question asked many times before (including by me)

http://www.passmark.com/forum/showthread.php?p=12591

[David (PassMark)]

Nvidia I'snt stupid and make the 590 more expensive and perform worse

It happens from time to time. You can't judge performance only on the price. But see the link above for more details.