I'm sorry but you can not compare a dual gpu card to a single gpu card. Performance does not always scale. I had a 4870x2 and it's performance compared to my 280 on average was very disappointing. There were games that ran fine on my 280 especially with mods that just ran horribly on the x2. I can't think of any game where it was the other way around. Sure the x2 performed better in some games but never by that much and usually in games where I didn't really need it and mods seemed to make things worse for the x2. Drivers make or break a multi gpu setup and with a single gpu you don't need to worry about that as much.
That said I can't wait to see what price that the 5870 hit since it seems like a solid card but I still wouldn't touch a 5970 with a ten foot pole.
Edit: I forgot to mention the 4870x2's (and from what I hear hemlock) disappointing overclocking potential. My 280 hits about a 25% overclock on the core on air, I don't know of too many x2s that can pull that off (or anywhere near it) on water.





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