2009 21.5" iMac, max RAM states 16GB, can I use 2x 8 GB sticks? or does it have to be 4 x 4GB? | MacRumors Forums
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Crucial - DDR4 - kit - 16 GB: 2 x 8 GB - SO-DIMM 260-pin - 2666 MHz / PC4-21300 - unbuffered - CT2K8G4S266M - Computer Memory - CDW.com
I'm updating my RAM. Currently, I have 2x8=16, but I want 32. I am thinking of just buying one 32GB. How much do I lose not being able to use dual channel
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1x16GB vs 2x8Gb vs 4x4GB RAM in 2020 | Single Channel vs Dual Channel | 1080P, 1440p and 4K Tests - YouTube
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