Very good testing indeed! The SLI bridge is clearly just to split the bandwidth communications between the GPU's. Or moreso a more efficient communication path. Looks like your CPU score is down a bit on the second test, which would bump up the test with SLI bridge a bit, but overall SLI bridge only improved ~1% in average framerate.
What would be interesting is to test both cards on a PCI-E 1.x vs PCI-E 2.x as the bandwidth of course is basically double on PCI-E 2.x.
Thanks for posting!
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