Read this one -> http://h10025.www1.hp.com/ewfrf/wc/genericDocument?docname=c00612217&cc=us&dlc=en&lc=en&jumpid=reg_R1002_USEN
Some machines only show 3GB RAM. With nearly no payback past 2GB it's money not well spent.
I have to make a choice between 2GB memory and 4GB memory.
I plan on doing a lot of gaming with my new computer and I want a second oppinion on the 4GB memory for 225$ more