SLI vs crossfire

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Isn't most 2900xt 512 MB? So it should perform better than 8800gts 320 MB, yes?

What about 8800gts 640MB x2 vs 2900xt 512MB x2?

How much does the MB matter anyway? I assume it has to do with texture mostly?

Also if I remember right, SLI need to be a bit more careful when choosing motherboard; what about crossfire? Anything I need to be cautious about?
 
For the most part, CrossFire is very good and efficient, but it has some major issues in some games (stalker for example) where it is actually slower than one card. I'm sure that SLi sometimes has problems like these as well though.
 
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