Intel Z790 motherboards support up to DDR5-6800 or DDR4-5333 memory | Club386
memory - RAM and Motherboard compatibility - Super User
Amazon.com: OWC 32GB (2 x 16GB) PC19200 DDR4 2400MHz SO-DIMMs Memory Compatible with Mac Mini (Late 2018), 27" and 21.5" iMac (Mid 2017), and Compatible PCs (OWC2400DDR4S32P) : Everything Else
What RAM (Memory) Is Compatible With My Motherboard?
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