billmck wrote:
I also bought the 21.5” iMac earlier this year, planning to increase the memory myself. I found you could do that on the 27” iMacs, but on the 21.5” iMacs. I returned mine for full credit via Apple’s 14-dayreturn policy and ordered the 21.5” iMac with 32 GB already installed. It wasn’t cheap and took a couple of weeks to get it, but I have no regrets.
Depending on how much RAM you want up front, sometimes the 27" iMac plus third party RAM can be less costly than the 21.5" iMac with Apple RAM.