Both cards are at the moment basically used for eyecandy only. I think it would be pretty hard to make it worth much more. Consider that not everybody will buy this hardware and if you dedicate parts of the physics to these systems, you have to make physics the same for single- and multicore-PCs and both in combination with a physics coprocessor.
As tempting as it may sound, I doubt it will be more than providing additional eyecandy.
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