Now, I've noticed that Apple are being sneaky, because if you choose only 2GBs of RAM it comes as a pair (2x1GHz). Now if I wanted to buy some after market RAM and boost it up to 4GB, would I have to replace the whole lot or could I get away with buying a 3GB stick and leave one 1GB stick in there? I'm not sure whether the iMac uses matched pairs or not - would having a 3GB plus 1GB set-up be slower than a 2x2GB set-up?
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Upgrading Mac RAM
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You either replace one of the 1GB sticks with a 2GB stick or do both. I have 3GB total installed and it's plenty fast even when running WinXP in a VM Fusion session with 1GB allocated to it...
Hello and welcome to the forums. MacRumors has guides on many Apple related things include RAM. Look at the tabs at the top of the page. Here are two that are relevant to you.
Understanding Intel Mac RAM - Mac Guides
Matched RAM on Intel Macs - Mac Guides
Understanding Intel Mac RAM - Mac Guides
Matched RAM on Intel Macs - Mac Guides