G.Skill Ripjaws V 32GB (2 x 16GB) DDR4 4000 MHz CL16 288-pin DIMM Black Memory (F4-4000C16D-32GVKA) - Bleepbox
Patriot Viper Steel DDR4 16GB (2 x 8GB) 4000MHz CL 16-16-16-36 UDIMM Low-Latency Gaming Memory Kits - PVS416G400C6K at Amazon.com
G.SKILL Releases High-Performance 64GB (8GBx8) Memory Kits in DDR4-4300 CL19 & DDR4-4000 CL16 - G.SKILL International Enterprise Co., Ltd.
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32GB G.Skill DDR4 Trident Z Royal Elite Silver 4000Mhz PC4-32000 CL16 1.40V Dual Channel Kit 2x16GB
G.Skill Trident Z Royal 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-32GTRS at Amazon.com