I just realized that once I enable SLI in the sig rig that I no longer select which card I want to run PhysX on? I had the option from the drop down to select either the GTX285 or 9800GT but it went gone the minute SLI is enabled
Try disabling SLI, then select the 9800GT for Physx, then enable SLI and see if its actually using the 9800 for Physx in a benchmark, if not then you have a much bigger issue, maybe driver problem, or maybe it isn't possible to do what you are trying to do.
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