actually you can have too much ram... apart from it being expensive, (and wasting your money) if you have dual channel, you get less fps if you have 2gb than 1gb.
I do realise i wasted my money in the present having 1.5gb's, but i made a huge mistake of getting 512mb, and i didnt want to have to throu all that away when games require 1gb, and it wouldnt surprise me if that is in 2005.