Lenovo 8GB DDR4 2133Mhz ECC SoDIMM Memory at Amazon.com
A-Tech 8GB Replacement for HP 797258-581 - DDR4 2133MHz PC4-17000 ECC Unbuffered UDIMM 2rx8 1.2v - Single Server Memory Ram Stick (797258-581-ATC) at Amazon.com
HP 752368-081 8GB (1x8GB) 1R x4 DDR4-2133 CAS-15-15-15 Memory at Amazon.com