I have an iMac Late 2006 2.0 GHz with 1 GB RAM. I am looking to upgrade it. The maximum it will take is 4GB but the system will only use 3GB of it. I was chatting to a live chat on crucial.com they said: On apples website it states that for best performance, make the sticks equal. What is the best thing to do? Ignoring the non-equality of the sticks, 3GB would be better, but 2GB might be better if its equal. It is a little expensive to pay for 2x2GB and have it only use 3GB. I am in the UK, if you were to suggest other sources of RAM.