the gtx460 sli setup is only marginally behind a 5970 (hence why its so popular). when OCd they surpass it.
Im fully aware of that. I went from a 480 to gigabyte 460 1g sli. The only reason I said that is because he may want the same performance level of the 5970. And I mean very loosely the same performance.
The 460 will only sli with another card so thats as good as it gets. I love my cards and they are killing any game they get to but youve already hit the perverbial ceiling in performance. At least with a stronger card, you can run more than 2 cards. Also, since the 460 came out, you can find the 470's for about the same price as the 460's.