Geeks3D is working on a new version of PhysX FluidMark that will have support for multi-core CPU support, so NVIDIA is telling the truth it sounds like.
http://www.gamephys.com/2010/02/16/...u-support-in-physx-coming-to-physx-fluidmark/
http://www.gamephys.com/2010/02/16/...u-support-in-physx-coming-to-physx-fluidmark/