You can't upgrade the RAM. Only on the 27 you can. I don't know if even Apple can upgrade it.
Probably been asked already, but is it possible at all to upgrade ram on the new 21 inch iMac myself, or would I have to pay the ridiculous price for Apple to do it for me?
Take a look at teardown photos. Upgrading RAM looks like piece of cake, with slim fingers and manual skills you can probably even do it without removing logic board.
You can upgrade from 8gb to 16gb on the site, but for £160 extra.![]()