I have to say that I love my 256MB, and windows uses it up all of the time. Unreal/UT are memory hogs without tuning, Q3 has to have a tweak to use over 56megs. Windows by itself allocates 40-50% of the system memory to Disk Cache. So if you have more it uses more. This will increase disk performance if you leave your computer running. I love it. The law of diminishing returns does come into play, but the 128mb myth is a myth.