To be honest from tests I have done so far you don't need a partition for just the swap file - It HAS to be on another drive then your primary OS and things like Apps and games, but as long as you have made a set swap file size (for example 3gig) and you have already defragged the drive you could put it on a partition on another drive which is already in use. However, I have found the best preformance so far in games like Doom3 and just general navigation when having Poser 5 open when I have: 1) Formated the parition 2) Put a set sized Swap file on that Partition first Also I have been using two drives now for my swap file - funny enough that does help. Basically what I have been reading is that Windows will use the drive that isn't doing anything at the time of the operation. So if you have a set size on one harddrive, and then the same set size on another harddrive then it will pick which one to used based on the speed. This isn't the best for my situation right now because the only drive I could test this on was an ATA-100. But it appeared to work. I tested by getting Poser 5 to do a render, while I was copying a large amount of files across my primary Raid-0 ATA-133 drive. I have lights on all my drives, and sure enough the ATA-100 (which is my secondary drive on my IDE channel) became active instead of my normal ATA-133. When I didn't have the ATA-133 drive doing anything, that was used. If there is anyone else that can confirm this - it would be good.