Well.. I mainly use my PC for gaming.. I have an ati 5870 video card (which I like alot).. I haven't increased my ram due to I've noticed that while playing games at the same time watching videos, playing music, a bounch of web browsers open, ect, ect.. even with all these programs running at the same time, the total ram being used was just a bit over 2.5gb... so , I was like "since I'm barely using half of my Ram, I shouldn't have to increase it"... Am I right with that conclusion, based on my test... and yes.. I use Win 7 pro 64 bit.