Hmm, I was using 1GB + 256 MB ram before on Pentium M 1.6 wINDOWS xp. It was not enough for me. I am used to opening many many many firefox tabs and also using many addons. I also use a few programs at once, typically firefox, WMP, download manager, systmem utilities, MSN. It normally exceeded 1GB after a long session of surfing. So I changed to 2x 1Gb and the performance was obviously much better cause no need to use virtual memory anymore. But I noticed on more thing. Even when I have a few programs running, like 500-700MB of Ram used only, my computer was very much faster on 2x 1GB compared to 1Gb + 256 MB. I believe this is due to the utilization of dual channel tech when I am on 2 x 1GB. Dual channel be used when two pieces of RAM are of different capacities.