Usually the problem is with thw swap file allocation size and physical memory. remember you have physical memory + swap file. I have a laptop with 2g ram and was having a bit of problems with Poser 6, I changed my swap file from 3x physical memory which was a swap file of 6gig down to a swap file of 2gig and problems started going away. I turned off the swap file and only used physical memory and poser 6 was doing fine, but windows OS was acting wierd so I went back to a 2gig swap and things seem fine on my poser6 now. something to play around with. remember all the textures become uncompressed in memory and in large scenes and high render sizes memory goes quickly. check your bucket settings and read the manual about memory useage if you have not already, it gives some simple examples. win xp pro uses around 256 meg just it's self (it's high, cant remember exact memory useage), throw in 2 V3 models with high textures a high res temple and render at 6000x4000 and you will be eating memory up like it was candy.