Subdivision workflow in Mudbox 1.0

[riggs]

Hey all

Been loving Mudbox so far while practicing digital sculpting, and am now noticing some of the limitations regarding poly limits when subdividing to higher levels if I want to see an entire character in the viewport. This seems to be a common issue with Mud 1.0 and may be getting really enhanced in Mud 2009. But until then, could anyone give some workflow tips regarding local subdivision? For example, I would like to take my entire mesh to a 5th subd level, but this pushes it to over 2 million faces. The machine then has ram issues and cannot display it.

My apologies to folks for a newb question like this, so any thoughts or existing threads on the topic are greatly appreciated. I have tried selecting smaller groups of faces and subdividing only them, but I am not sure how this affects the overall workflow and subtleties of the sculpting process. I have also tried the "move levels data" option in the Mesh menu, to try and free up ram by using hard drive memory, but this seems to not have the desired effect.

machine specs:
Windows XP Pro 32 bit
4 GB Ram
Dual Intel Core 6700 CPU @ 2.66 Ghz
NVidia GeForce 8800 GTS graphics card 640 MB ram
300 GB SATA Western Digital hard drive

I know Windows XP 32 bit can only use up to 2 GB for once process, so this may be my limiting factor, not sure. Even if it is, workflow tips are still much appreciated. Thanks again for any help.