Okay. So for a long time I've been wondering why my RAM isn't counting up correctly. Here's the setup I have on the top riser. 2x 512MB = 1GB 2x 1GB = 2GB This should equal 3GB but it doesn't. It keeps telling me I have 2GB. Is it because they all have to be 1GB sticks? Like, the same amount of ram in the same slot? Also how would I use the 2x512MB of RAM? Could I place those on the 2nd riser and have it read? Just confused about this whole thing... I'm planning to buy more RAM soon but I don't want to get the wrong ones..