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AddOn 32GB DDR4 SDRAM Memory Module - 32 GB (1 x 32 GB) - DDR4 SDRAM - 2133 MHz - 1.20 V - ECC - 28 at Amazon.com
G.Skill Trident Z RGB Series 16GB (2 x 8GB) 288-Pin SDRAM (PC4-25600) DDR4 3200 CL16-18-18-38 1.35V Dual Channel Desktop Memory Model F4-3200C16D-16GTZR at Amazon.com