No need to worry about the extra RAM until/unless you hear Poser transfering data out to the hard drive's paging file. It all depends on scene complexity, e.g. Jim Burton's CPU Perfoance test exercise (there is a thread about it some time back) showed that for that scene 512MB was sufficent. If you have system instability with large page files and very, very large scenes, it may be because Poser is getting close to the hard 2GB memory limit (of any 32-bit app). In which case consider setting your page size such that 2GB can't be reached (e.g. for my 1GB real mem system I have Page size set to 960MB).