depending on the OS you may or may not see the entire 4GB RAM.
Lots of info available here on CNET re Win XP and the ram limits.
i have a basic question that im either too stupid or too lazy to figure out on my own... does anyone know if i would be able to put Patriot Extreme Performance 4GB(2 x 2GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Dual Channel Kit Desktop Memory into a CyberpowerPC Gamer Ultra 7200 Athlon 64 X2 6000+ 2GB DDR2 500GB NVIDIA GeForce 8600GT Windows Vista Home Premium... if you wanna look at the specs and stuff heres a link:
-- http://www.newegg.com/Product/Product.aspx?Item=N82E16883229003 --
thanks to anyone who can answer this for me... haha its probably a pretty simple question, i wouldnt know though..