HP 16GB (1x16GB) Dual Rank x8 DDR4-2133 CAS-15-15-15 Unbuffered Standard Memory Kit at Amazon.com
A-Tech 16GB Replacement for HP 797259-091 - DDR4 2133MHz PC4-17000 ECC Unbuffered UDIMM 2rx8 1.2v - Single Server Memory Ram Stick (797259-091-ATC) at Amazon.com
HP 8GB (1x8GB) Dual Rank x8 DDR4 2133 MHz 288-pin DIMM RAM Module SDRAM (726718-B21 ) at Amazon.com