Hello, i was wondering if some1 could tell me what exactly does computer ram do to make your computer better. And i want better ram for performence in games and if it helps all the applications i have work faster at one time. Id have sometimes 7 different applications working. My ram is at 512 and i want to know if i can add a 1 gig on the extra slot without removing the first one so id have 1.5 gig of ram. Can i do that or do i have to buy a 512mb or id have to get a new one and remove my old one please some1 help me. Im pretty good with computers considering im 14 years but some stuff i still need help. Thx