I don't have any benchmarks, but the SLI technology mostly helps if you are fill rate limited. If this is not the case for you, then it's probably not worth it. I generally recommend the high end GeForce cards and nVidia just released the GeForce 9 series. Unfortunately, nVidia doesn't provide stereo drivers with their latest cards, so if you need frame sequential stereo then you will need a Quadro card. Either way, I recommend nVidia cards over ATI.
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