I do not know how much memory Poser can use, but since it is a 32-Bit software, there is no way it can use more than 2 GB Ram, due to adress limitations. This is true on 32-Bit and 64-Bit Windows. No matter how much RAM you have, no matter how big your virtual memory is, 2 GB is maximum for a single thread.

To use more RAM, the software has to be recompiled for 64-Bit. Such an application cannot longer be run with a 32-Bit system, so the market for it is pretty small up to now. Few people are running 64-Bit systems.

I do think Poser 7 could have a version which supports 64-Bit, if it sells good enough. But since the only advantage of 64-Bit systems is the ability to use more than 2 GB RAM  chances that 64-Bit will become standard are slim. We probably will have to wait and see.

At the moment I would not expect any real advantages from using 64-Bit Windows.

A ship in port is safe; but that is not what ships are built for.
Sail out to sea and do new things.
-"Amazing Grace" Hopper

Avatar image of me done by Chidori.