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G.SKILL F4-2400C15D-16GFX 16 GB (8 GB x 2) Flare X Series DDR4 2400 MHz PC4-19200 CL15 Dual Channel Memory Kit - Black at Amazon.com
Corsair Memory Kit 16GB (2x8GB) DDR4 2400MHz SODIMM Memory, (2 x 8GB) at Amazon.com
parts-quick 16GB Memory for Dell OptiPlex 7050 SFF/Tower DDR4 2400MHz Dual- Channel Non ECC SDRAM DIMM RAM at Amazon.com