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
G.SKILL Trident Z Royal Series 16GB (2 x 8GB) 288-Pin RGB DDR4 3600 (PC4 28800) Desktop Memory F4-3600C16D-16GTRG at Amazon.com
G.SKILL 64GB (4 x 16GB) Trident Z Royal Series DDR4 PC4-28800 3600 MHz 288-Pin Desktop Memory Model F4-3600C16Q-64GTRGC at Amazon.com
You want 64GB of RAM for 3900X/3950X? You might wanna consider 4 x 16GB Crucial Ballistix Sport LT DDR4 3200 CL16 - They can go 3200 CL13 / 3600 CL14 / 3800
Crucial Ballistix RGB RAM Red - 16GB kit, 3600MHz - £63.04 sold by Amazon EU | 16gb, Kit, Crucial
G.SKILL F4-3600C16D-16GTZR 16 GB (8 GB x 2) Trident Z RGB Series DDR4 3600 MHz Dual Channel Memory Kit - Black with Full Length RGB LED Light bar at Amazon.com
G.Skill Trident Z NEO Series 16GB (2 x 8GB) 288-Pin SDRAM (PC4-28800) DDR4 3600 CL16-19-19-39 1.35V Dual Channel Desktop Memory Model F4-3600C16D-16GTZNC (B07WVT8SGF) | Amazon price tracker / tracking, Amazon price history
G.SKILL Trident Z Royal Series 16GB (2 x 8GB) 288-Pin RGB DDR4 3600 (PC4 28800) Desktop Memory F4-3600C16D-16GTRG at Amazon.com
G.Skill Ripjaws V Series 32GB (2 x 16GB) 288-Pin SDRAM (PC4-25600) DDR4 3200 CL16-18-18-38 1.35V Dual Channel Desktop Memory Model F4-3200C16D-32GVK at Amazon.com