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Gigabyte 2666MHz DDR4 16GB (2x8GB) RAM - Pangoly
Silicon Power DDR4 16GB (2 x 8GB) RAM 2666MHz (PC4 21300) 288-pin CL19 1.2V Non ECC Unbuffered UDIMM Desktop Memory with Heatsink SU016GBLFU266BD2J6 at Amazon.com
Best Buy: HyperX FURY HX426C16FB3AK2/16 16GB Kit (2 x 8GB) 2666MHz DDR4 DIMM Desktop Memory Kit with RGB HX426C16FB3AK2/16
Apple Memory Module 16GB DDR4 2666MHz SO-DIMMS (2x8GB) - Apple
HP S1 RAM 16GB Kit (8GBx2) DDR4 2666MHz CL19 Laptop Memory - 8NN19AA#ABC at Amazon.com
Apple Memory Module 16GB DDR4 2666MHz SO-DIMMS (2x8GB) - Apple
OWC 16GB (2 x 8GB) PC21300 DDR4 2666MHz SO-DIMMs Memory Compatible with Mac Mini 2018, iMac 2019 and up, and Compatible PCs (OWC2666DDR4S16P) at Amazon.com