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G.SKILL 16GB (2 x 8GB) TridentZ Series DDR4 PC4-32000 4000MHz Memory Desktop Memory Model F4-4000C18D-16GTZKW at Amazon.com
Mushkin Redline Black – DDR4 DRAM – 16GB (2x8GB) UDIMM Memory Kit – 4000MHz (PC4-32000) CL-18 – 288-pin 1.35V Desktop RAM – Non-ECC – Dual-Channel – FrostByte Black Heatsink – (MRC4U400JNNM8GX2) at Amazon.com
G.Skill Trident Z NEO Series 32GB (2 x 16GB) 288-Pin SDRAM DDR4 4000 (PC4-32000) CL18-22-22-42 1.40V Dual Channel Desktop Memory Model F4-4000C18D-32GTZN at Amazon.com