Description:
HP 16GB (1x16GB) Single Rank x4 PC4-21300
DDR4-2666 CAS-19-19-19 Registered Memory Smart Kit

Part Number(s)
Option Part# 867855-B21
Spare Part# 872970-001
Assembly Part# 872837-091

Description:
HP 8GB (1x8GB) Single Rank x8 PC4-21300
(DDR4-2666) CAS-19-19-19 Registered Memory Smart Kit

Part Number(s)
Option Part# 867853-B21
Spare Part# 872969-001
Assembly Part# 872836-091

Description:
HP 16GB (1x16GB) Dual Rank x8 PC4-19200 (DDR4-2400)
Unbuffered CAS-17-17-17 Standard Memory Kit

Part Number(s)
Option Part# 862976-B21
Spare Part# 869538-001
Assembly Part# 862690-091