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What ram must i use for iMac mid 2010 21,5 ?
iMac 21.5", macOS 10.13
Your best bet is to purchase from suppliers like OWC and Crucial that specialize in iMac RAM.
see > https://eshop.macsales.com/shop/memory/iMac/2010/DDR3_21.5_27
and > https://www.crucial.com/usa/en/compatible-upgrade-for/Apple/imac-%2821*5-inch%2C-mid-2010
Maximum Memory= 16 GB
Memory Slots 4 - 204-pin PC3-10600 (1333 MHz) DDR3 SO-DIMM
RAM FOR IMAC 21,5 MID 2010
