600$ vs 649$ is a "fair" comparison IMO. If not unfair considering the extra 50$ you have to pay for a single 280.
Anandtech shows it vs GTX 280 SLI anyway. The nvidia cards win in Crysis, Quakewars, Assasins Creed and Oblivion. The 4870's beat 2 x GTX280's in COD4, The witcher and Bioshock. For 1300$ the two GTX 280's should've wiped the floor with the ATI's in any game.
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