^^ It might sell cheaper as well. Amd always price their cards lower and definitely has the pricing advantage.
I wonder how nvidia will price its gtx 560 non-ti version. That will be 6790 and 6850's true competitor.
Gtx 550 should have been priced less than 5770 to make absolute sense. After 560's launch, i am sure 550 will see some price cuts and challenge amd's cards lower than the 6790.