GeForce GTX 580 vs. GeForce GTX 460 1GB SLI
 

GeForce GTX 460 1GB SLI is currently a lot less expensive than a single GeForce GTX 580. Current pricing can put you in the driver seat of GTX 460 1GB SLI for $330, while GeForce GTX 580’s are going for ~$529 right now, over the MSRP of $499, with supplies dwindling.

GeForce GTX 460 1GB SLI offers performance that competes with a single GeForce GTX 580, but ultimately is limited by its 1GB of memory per GPU at high resolutions with AA. The GeForce GTX 580 offers a smoother gameplay experience and higher playable settings. The GeForce GTX 580 may be more expensive, but that price can pay off as we move into new DX11 games pushing the boundaries of graphics card memory capacity.

http://www.hardocp.com/article/2010/...vs_460_1gb_sli