I have a similar setup computer wise but am running win2k as the OS. I have heard that Poser has a memory leak or something (not sure what to call it), but I do know that if I am working a large project I had better save often. I currently have one that the pz3 for it is 85 mbs and I can average 4 to 5 renders okay and then I start getting the dreaded low memory or out of memory warnings. This is with a pagefile set to 3072 (in addition to the 256 ram). Rambooster helps some, since it allows me to do a memory dump and free up resources but even with this I have had Poser crash in the middle of rendering. (In all fairness, I do not know if this is a problem with Poser or with something else as I do not work with filesize that large in other aps.) If anyone knows the cause/solution, please don't keep it a secret. :o)