Apple iMac 5K Memory Kits at OWC
I’m crossing my fingers that 64GB might be possible in the new iMac.
But for now OWC has 8GB, 16GB and 32GB memory kits for the iMac 5K and the existing memory can be sent in for a OWC memory rebate. This nets out the cost of 32GB to about $358 (versus $600 at Apple, which pays for the faster CPU option!).