I can't really comment on those AMD cards but they look like they're about as powerful as a GTX 460 which
is about 1.5 years old.
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I'm running 4 screens off an ATI 6990 with aftermarket cooling http://www.arctic.ac/en/p/cooling/vg...90.html?c=2182 since the stock one is unbearably loud. I prefer 1 card solutions because cooling is far easier to manage, if you plan to go for 2 or more cards (in separate PCI slots) then you really should have watercooling.