I've installed 2 gig of RAM on my R15. System Properties indicates the computer has 1.98 GB, which is fine. However, when I look at Toshiba's Notebook Maximizer, it indicates the computer has Total Physical Memory of 2032 MB but Available Physical Memory of only 1431 MB. Can anyone explain this to me? Is it a problem? The same issue happens on my Toshiba M45 conventional notebook, too. If I use the original 512 chip and only one of the new 1GB chips, I get a similar problem--reported Physical Memory of about 1.5 GB but Available Physical Memory of 1 GB. This seems like more than the shared graphics claims, right? I searched the Toshiba support DB and a few 3d party forums like this but didn't run across an answer. Apologies if I overlooked it.