I usually create a partition for my swap file and then set min/max to the same size. U I've been using 2gb fixed size recently. Fragmentation of the swap file is the biggest killer, and it usually can't be defragged since it is a locked system file. So if nothing else set a static size. Using a dedicated partition ensures its clean file space and the file isnt fragmented when first created. I ususally move my Temp folders to that partition too, after I create the swap.