A-Tech 16GB Kit (2 x 8GB) for Dell PowerEdge R440 - DDR4 PC4-21300 2666Mhz ECC Registered RDIMM 2Rx8 - Server Specific Memory Ram (AT316637SRV-X2R8) at Amazon.com
TEAMGROUP T-Force Vulcan DDR4 16GB (2x8GB) 2666MHz (PC4-21300) CL15 Desktop Memory Module ram - Red at Amazon.com
Crucial Memory Kit with 16GB (2x8GB) DDR4 PC4-21300 2666MHz SR x8 SODIMM Memory (CT2K8G4SFS8266) Compatible with HP EliteDesk 405 G4 Mini, 705 G4 Mini, 705 G5 Mini at Amazon.com
Amazon.com: Corsair Vengeance LPX 16GB (2x8GB) DDR4 DRAM 2666MHz (PC4-21300) C16 Memory Kit - Black : Everything Else