I have always found crucial to be the best place for well priced, good quality, reliable memory in the UK + life time guarantee! Just stick with them IMO.
I vote for Crucial, Apple notebooks are very fussy about the RAM that they will work with, I tried two types of RAM from a local supplier, before I gave up and purchased from Crucial, which worked first time.
I vote for Crucial, Apple notebooks are very fussy about the RAM that they will work with, I tried two types of RAM from a local supplier, before I gave up and purchased from Crucial, which worked first time.
I really don't know the answer to that one, all I know is that they are, from personal experience as I looked at the RAM specification on the documentation and that is what I ordered and it didn't work. Many other people have had problems using RAM not certified to work on a Mac. I can only presume that it is because Apple have complete design control over key components such as the motherboard, unlike PC manufacturers who tend to use generic motherboard designs, in desktops in any case.
I am not saying if you buy uncertified RAM it will not work, as many people have been successful, only that it appears more risky than PC computers.