Tip: Always buy the 8 GB version, which has 2*4 GB installed. Then buy one or two RAM bars, for example: Samsung M471A4G43MB1-CTD (1x, 32GB, DDR4-2666, SO-DIMM 260 pin)

Installing RAM on the iMac is really child's play. Apple charges exorbitant prices for the RAM upgrade. For example, you pay CHF 2800 for 128 GB RAM, while here at Digitec you can get 128 GB RAM for CHF 560...