Maybe Windows itself gets slow? I dunno, 2 gigs makes BF2 and FEAR smoother + load faster, and I can jack up Doom 3 on ultra and get no hitching. It really is worth it. Actually XP 32-bit has a total capicity for 4 gigs of RAM and will refuse anymore. Now, difference between 2 and 4 gigs is undectable and not worth upgrading to.