SK Hynix HMAA4GR7AJR8N-XN 32GB DDR4 SDRAM Memory Module for Server - 32 GB - DDR4-3200 & PC4-25600 DDR4 SDRAM - 3200 MHz Dual-Rank Memory
DDR SDRAM - Wikipedia
HP 8GB (1x8GB) Dual Rank x8 DDR4 2133 MHz 288-pin DIMM RAM Module SDRAM (726718-B21 ) at Amazon.com
G.Skill Trident Z Royal Series [Silver] 32GB (2 x 16GB) 288-Pin SDRAM (PC4-28800) DDR4 3600 CL19-20-20-40 1.35V Dual Channel Desktop Memory Model F4-3600C19D-32GTRS at Amazon.com