You can run poser pro fine in 32 bit OS systems, but you won't see the advantages of the 64 render speed increases.

I'm seeing almost twice the render speed here, though SM seems to downplay the speed improvements and "minor".. but it's far from minor on my system.

(realistically I'm seeing abiout a 70% increase in render speed on vista 64, poser pro's 64 bit background render, and 4 gig or ram.)

Way too many people take way too many things way too seriously.