I am planning on getting new RAM for my Dell Dimension 8250. It currently has 512 MB (2 x 256) and I am planning on either getting 2 x 512 more (to have 1.5 gigs total) or just getting 2 x 1GB to have 2 gigs total. I am a hardware noob and what do I need to know about compatibitly? Does it need to be compatible with my mother board? How? What about with my current ram? And what would you reccommend? The only thing I know is to trust Corsair (I don't know of any other companies to trust). Is there faster RAM and slower RAM. What should I know? Thanks in advance.