Yea, I ran Windows Memory Diagnostic extended test for about....4-5 hours and no problems were found. It's just that at idle 40% of the memory is used and when gaming, I'm sure it'll go up to maybe 100%.
Just a side question: when buying RAM it's best to buy the almost exact same as the one already installed, right?
I currently have G.SKILL Extreme Series 1GB (2 x 512MB) 184-Pin DDR SDRAM DDR 400 (PC 3200). At the time, everyone was saying 1Gb was plenty. Now I think I'll buy 2Gb to add on to and currently looking at this one:
Link