This is a very odd question for multiboxing forums but I Googled the answer in less than a minute.
http://www.nvidia.com/object/physx_faq.html#q4
Finally we can put the above two configurations all into 1 PC! This would be SLI plus a dedicated PhysX GPU. Similarly to the 2 heterogeneous GPU case, graphics rendering takes place in the GPUs now connected in SLI while the non-matched GPU is dedicated to PhysX computation.
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