I can tell you this method works fine for still renders, but try it with more than 2-3 animated millennium characters. Vue 5/6 Inf. will crash, every time, even when only using 1.5 gig RAM. My rendering machine has similar specs as yours - Dual Opteron 270, 8 gig RAM, XP64.

I don't think Vue has problems with large meshes or large textures, but it cannot handle Poser animation worth a damn, unless it is instanced. I'm sure this is related to the Poser SDK somehow, but the point remains that with 2-3 animated millennium characters (with full clothing, weapons, etc.) Vue will crash every time when it gets to 1.5 gig memory usage.