iMac 2020 not running at 2666Mhz ! I installed 4 sticks of crucial 8GB 2666Mhz RAMs. Works fine if I take two out. All four installed gives only 2133Mhz. Any idea what's
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Crucial 32GB (2 x 16GB) DDR4 2666MHz SODIMM Memory Upgrade Kit CT2K16G4SFD8266 Compatible with iMac Retina 5K 27-inch 2019 (iMac19,1) and Mac Mini 2018 (Macmini8,1) - Walmart.com
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