The Particle Flow Tools Box from Orbaz has been PhysX accelerated for some time, but only in the 32-bit version of 3ds Max. The latest version, version 1.05, now supports the true 64-bit version.
“1.05 version of Box#2 Pro uses 64-bit PhysX SDK v.2.8.3. That allowed us to switch completely to native PhysX libs for both 32- and 64-bit versions. The new version works without restrictions on 64-bit flavors of Win XP, Vista and Windows 7. The update is not a beta, and it is available to all licensed users of Box#2 Pro.
via Particle Flow Tools Box 2: now with true 64-bit PhysX | PhysXInfo.com – PhysX News.
