G.SKILL RAM TridentZ Series - 16 GB (2 x 8 GB Kit) - DDR4 4000 UDIMM CL19 at Amazon.com
G.SKILL 16GB (2 x 8GB) TridentZ Series DDR4 PC4-32000 4000MHz Memory Desktop Memory Model F4-4000C18D-16GTZKW at Amazon.com
TEAMGROUP T-Force Dark Z FPS 16GB Kit (2x8GB) DDR4 Dram 4000MHz (PC4-32000) CL16 Desktop Memory Module Ram for Low Latency TDZFD416G4000HC16CDC01 at Amazon.com
TEAMGROUP T-Force Dark Z FPS 16GB Kit (2x8GB) DDR4 Dram 4000MHz (PC4-32000) CL16 Desktop Memory Module Ram for Low Latency TDZFD416G4000HC16CDC01 at Amazon.com
G.Skill Ripjaws V Series 32GB (2x16GB) DDR4 4000MHz CL18 1.40v RAM $226.20 + Delivery ($0 with Prime) Amazon US via AU in 2021 | Ddr4, Series, 32gb
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
ThermalTake Releases TOUGHRAM 4000Mhz, 4266MHz and 4400Mhz Models – goldfries
G.SKILL Launches New DDR4-4000 CL16 Memory Kits For Intel 10th Gen Comet Lake-S | HotHardware
v-Color Prism Pro RGB SCC(2+2) Kit 16GB (2x8GB) 4000MHz (PC4-32000) DDR4 RAM with RGB Filler Kit Gaming Desktop Memory Module Ram Upgrade (SCC-TL8G40819D-E6PRSWK) at Amazon.com
G.SKILL, 2 x 8 GB (16GTZR), Black Trident Z RGB 16 Go (2X 8 Go) DDR4 4000 MHz CL17 at Amazon.com
Corsair Vengeance SODIMM 32GB (4x8GB) DDR4-4000 (PC4-32000) CL19 for Intel X299 Systems - CMSX32GX4M4X4000C19 at Amazon.com