Single RAM slot upgrade
How does the memory bus look like in the 21,5” iMac? It has got two slots. Can I upgrade those individually or do they have to be in pairs. My guestimate of course is, that they have to pair up, but what are the facts?
Reasoning behind the question: one 16Gb stick is same price as two 8Gb and would add up to 20Gb when one 4Gb stick would stay in the mac. Also at a later point I could upgrade it to 32Gb, by buying one additional 16Gb.