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Amazon.com: Crucial RAM 8GB DDR4 2400 MHz CL17 Memory for Mac CT8G4S24AM : Everything Else
PNY Performance 8GB DDR4 DRAM 2666MHz (PC4-21300) CL19 (Compatible with 2400MHz or 2133MHz) 1.2V Notebook/Laptop (SODIMM) Computer Memory RAM – MN8GSD42666 at Amazon.com