I sent a pair of 570's back after testing the vram limits clearly crippled for the money ,even worse for the 1 gig 560ti, having water block's that fit the 580's went with them,
I also see alot of people with 1 gig's of vram having more issues with bf3 than 580\6970 users , so I'am glad I have more money than sense , not to mention what games that might come out in the next year with the consoles on their way to be upgraded.
-and been looking a lot at the U2711 lately which even with 580sli I wonder about the min. fps gaming for the next year , when the 2nd gen. of 28nm might be for sale.