For Vantage scores, it's great (although technically cheating, Futuremark haven't, and never will approve the PhysX drivers for use in Vantage). But in games that actually support physics processing through PhysX (Unreal 3 is the only one I know of), there is actually a performance hit since the GPU has an extra task to deal with. Although the CPU may be freed up, the GPU becomes overloaded. A secondary GPU dedicated to Physics might bring a performance boost, but only in the few games that actually support PhysX on the GPU. For now, it's best to keep Physics processing on the CPU.
I found the 177.41 to be the better driver tbh
Thanks. I tried 177.35, but I couldn't get PhysX working on it, so I moved to 177.39. I'm slowly moving through them and trying to find the best. I wish Nvidia would keep the BETA testing on consumers to a minimum through.
I noticed the little message. I'll get round to updating it at sometime. Thanks for reminding me.