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Kingston HyperX 1x8GB DDR4 4000Mhz RAM Memory Black | Techinn
32GB G.Skill DDR4 Trident Z Royal Gold 4000Mhz PC4-32000 CL15 1.50V Quad Channel Kit (4x8GB) - Walmart.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