I'm curently playing with the idea of uppgrading my memory, from 1 to 2 GB. I know that Battlefield and Fear are supposed to be smoother with 2GB, but what about HL2, UT2004, ESIV Oblivion, COD 2 and Doom3 ??

My system :
MSI K8T neo2 F, Athlon 64 939 3700, 1 gig DDR 3200 Dual Ch (2x512), Audigy, WD 120 SATA, Antec Sonata case / 380w true power.

You can never go wrong when buying more RAM - the games will always run better. On the PC from my signature F.E.A.R. swaps often, so you definetely should buy 2GB, if you want comfortable gameplay.