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
G.Skill Ripjaws 32GB 2 x 16GB DDR4-3200 PC4-25600 CL-22 SO-DIMM Memory Kit 3200C22D-32GRS - Micro Center