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Well not sure why nvidia is out of the question just because you are running 3 monitors. You can get the same effect out of 2 nvidia cards called nvidia surround... but if you want amd then the obvious would be to go 7970 and if you need more performance in the future then you can add another...
Yea, Really need to know what "price point" you are talking about. If you are looking to sell the 260 and use that money towards a new card then how much are you willing to put in extra? also what games and at what settings could help in suggesting a card too.
Try what sirmonkey said and try the most recent drivers from nvidia. Also try driver sweeper and completely remove any old drivers and the reinstall the new ones and see if that helps.
Really. You think he needs to upgrade an i7 950 for wow? That just sounds silly. Might try to sell the 5770 and pick up a 6950 if you can afford it. A 6870 should do good if on a tighter budget.
I thought the same thing but he did ask for nvidia. Can you crossfire on your board? another 5770 can be found for cheap if so and the pair will probably beat any single card in that price point in most cases.