iMac 2019 - upgraded w 2 extra ram and the speed dropped to 2400 MHz? | MacRumors Forums
v-Color 16GB2x8GB 2666MHz ddr4 Compatible for iMac | Ubuy Nepal
DDR4 2666MHZ PC4-21300 SODIMM for Apple iMac Mid 2020 & Mid 2019 (iMac
2019 iMac RAM 記憶體DDR4 2666 自己更換檢查不降速- YouTube
Memory Upgrades for 2019-2020 iMac 27-Inch - Up to 128GB
Timetec 64GB KIT(2x32GB) Compatible for Apple DDR4 2666MHz for Mid 2020 iMac (20,1 / 20,2) / Mid 2019 iMac (19,1) 27-inch w/Retina 5K Display, Late 2018 Mac Mini (8,1) PC4-21333 / PC4-21300 MAC RAM at Amazon.com
Apple Memory Module 32GB DDR4 2666MHz SO-DIMMS (2x16GB) - Apple (HK)