So I'm one of the many around here waiting for a new MBP, which I plan to trick out with a 200GB 7200rpm drive (already have) and 4GB of RAM (just ordered), but in the mean time, I am getting a Core Duo MacBook (NOT Core 2 Duo), so the max usable RAM is 2GB. Will it work fine with the 2x2GB in there, just recognizing 2GB? I guess if nothing else I guess I can just put one single 2GB stick in there, just losing the benefits of having 2 equal sticks in, though that may be negligible. I just figured I'd go ahead and get the 4GB since it will be put to use soon in a MBP (hopefully?) instead of buying 2x1GB and having no use for it later.