The way that it works, anyone please correct me if I am wrong, but the second card will do the calculating of the physics processes while the main card does the rendering.
In 3dMark Vantage you will get better scores withe Physx enabled on the main card, because it is often the faster card and during the test there isn't much graphically going on. In an actual physics coded game, you will see the improvement.
-Jason




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