Originally Posted by Johnny Guitar
SLI 570s in most scenarios beats the 6990
the performance of a 6990 is roughly the same as sli 570's. http://hardocp.com/article/2011/03/0..._card_review/9
"AMD Radeon HD 6990 vs. GeForce GTX 570 SLI
This is the dollar-for-dollar comparison. The AMD Radeon HD 6990 has an MSRP of $699. Currently, the GeForce GTX 570 is $350 online. Two of these for SLI will set you back exactly $700, right at the cost of the Radeon HD 6990. In this comparison, our gameplay testing reveals that the Radeon HD 6990 is going to offer you the better overall gameplay experience compared to GTX 570 SLI.
Civilization V was the only weak point for the AMD Radeon HD 6990, so if you are playing this game, then the 570 SLI will be better. In all other games, we experienced that the AMD Radeon HD 6990 will match or beat GeForce GTX 570 SLI. In fact in Crysis: Warhead there was a fairly large performance difference between AMD Radeon HD 6990 and GTX 570 SLI, with 6990 coming out on top. We also saw that when the Radeon HD 6990 was pushed to 4X AA with intensive shader options it was pulling as the lead. Since both options are at the same price, we have to say the AMD Radeon HD 6990 is the better choice, and it has more memory per GPU."