Pure PhysxInfo.com Fluidmark 1.2 will be released soon showing how well Phsyx works when multithreading optimizations are enabled. Results are below: From the graph a Q9400 is able to out pace a GTX275 using the multithreaded optimizations for Physx. However when 2 GPUs are used they out pace both. However, when mult-core physx is off the results are far less. Currently it's is believed that the current version of physx doesn't use this. This only adds to the speculation that the current version of Physx gimps CPUs.