As some of you know I want to upgrade ram in a pc and a notebook the pc uses use ddr166 and I think the notebook uses ddr133. Could I just buy ddr400 for both and let them scale down? I know the notebook needs ram as it's a 2Ghz with 128mb ram, I think thats a pretty huge bottleneck, but I'm not sure if the pc needs ram, it's a P4 2.4Ghz and has 512mb ATM, would it make a difference to upgrade, also the pc only has two ports, would it make a difference if I buy 1x1Gb instead of 2x512mb as then I could add another Gb later. . . phew thats alot 