It is easy, indeed. Just tell the driver to hold off frame requests from the second GPU until a certain time passes. This way, every frame will be sync'd.
But NO!!!! FPS will be lower. So neither NVidia nor ATI applies this very easy solution, just to keep those rocketing SLI/CF results in review pages.
And when FPS goes any lower, there's no incentive to buy SLI anyway.
Multi-GPU sucks. Just go with a 4870 or GT200.





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