I recently received an old computer from a friend for free. It's super old school but it works and all it is used for is for my 4 year old son to watch netflix in his room and an occasional google search. The system consists of an asus P4P800SE motherboard, intel 3.4 ghz pentium 4 (478 socket lol) cpu, and 512 mb of ddr 400 ram. For some reason the ancient ddr400 ram is extremely pricey (around $25 per gb). My first question is how much improvement would I see by adding just 1gb of ram. If not, then how much would I need to notice a significant difference in performance?