I already have 2x2 GB RAM in my iMac. Is it possible to add 2x4 GB, thus having 12 GB in all, or does it need to be pairs (e.g. only the same size in each of the four slots)?
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First here's the Apple TN on upgrading your systems memory iMac: How to remove or install memory
In this model you really need to replace or add memory in pairs (Bank 0 & Bank 1) as the memory is used by the system interleaved to speed up reads/writes to memory.
While the system can handle mixed banks of different sized modules you loose the interleaf and if you happen to use different spec'ed modules of the same RAM size in a mixed set you can get into odd errors. Replace in a matched pair (don't mix manufactures or lots).
And, Yes, you can have different sized pairs of memory 2x2GB & 2x4GB = 12GB. Which I think is what you are after here.
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