http://www.guru3d.com/article/geforc...ti-sli-review/
If I had sli 280s I'd keep them until next gen shows up and see how the green 6xx/ red 7xxx series does. Currently squeaking every last bit out of a single gtx280 until the powercolor 6850 that I had won back in August shows up eventually, maybe, kinda given up on it.
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x4 965BE 3.7ghz / Tuniq Tower 120/ xfire HD6870s / 4x2GB G.skill/ S12D 850w/ Ga Ma 790X-UD4/WD640AALS Black x2, WD1TB FALS x1, Seagate 250GB x1/ BenQ 21.5" 1920x1080/ Win 7 64