Originally Posted by snowmanwithahat
I think I saw that he's running 3 displays, in which case you could definitely see the benefit moving to more graphics horsepower.
Also as a general note... dual-core cards don't count as using SLI... I could use a 295 / 590 on my system and even though it's a P45 chipset it will work.
It only says one display in his sig, if three I'd recommend two of the new 2.5GB GTX570s over the two 3GB 580s unless money is no object. Either way, he's CPU limited already.
Dual core cards are exactly the same as using SLi in terms of how they rely on AFR.