Hi all, I have a 2.33Ghz 15.4" MBP with the standard 2Gb of Ram. I have gone to crucial.com/uk and they say that I can accommodate an extra 1Gb of Ram but that it'll have to be a 2Gb stick, so i'd end up with 1x 1Gb and 1x 2Gb giving the total 3Gb. Crucial are recommending that I buy matched pairs from them so that the 1Gb and the 2Gb are both the same make. Is this really necessary? Can't I just buy the single 2Gb, install it and then be sorted? Will it really make a difference if I don't have both the same make. It sounds to me like Crucial are trying to make a bit more cash. However I want to check before taking the plunge. Thanks all for your help.