Zadak 511 Shows Single Stick 32GB "Double Capacity" DDR4 RAM
A-Tech 32GB Replacement for HP P07646-B21 - DDR4 3200MHz PC4-25600 ECC Registered RDIMM 2Rx4 1.2V - Single Server Memory RAM Stick (P07646-B21-ATC) at Amazon.com
Micron 32GB, DDR4, 3200MHz, CL22, Single Stick (114204)