Bought in the minimum RAM capacities and this 2 x 8 GB bought Samsung RAM memory cards the iMac. Can be easily inserted into the RAM slot on the iMac. Since the first launch with the 24 GB RAM (2 x 8GB Samsung + 8GB already in the iMac) runs everything great - not a single crash. It was quite important that these memory cards have only 1.35V voltage, as I have read in forums that the usual 1.5 V cards can bring the iMac Late 203 to crash.