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867855-B21 — Memory Specs & Substitutes

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HPE · DIMM
WHAT YOU NEED TO KNOW
2Rx4 = Dual Rank ×4 chip width (standard server) RDIMM = Registered (servers) | LRDIMM = Load-Reduced (max density)
DDR3 ≠ DDR4 ≠ DDR5 — physically incompatible (notch position)
PRODUCT OVERVIEW

HP 867855B21 memory module 16 GB 1 x 16 GB DDR4 288-pin DIMM. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels. Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
867855-B21
SPECIFICATIONS
Part Number867855-B21
ManufacturerHPE
InterfaceDDR4
Capacity16GB
COMPONENT DIAGRAM
ECC 16GB 2Rx4 PC4 — RDIMM HPE NOTCH ~133.35 mm DDR4 RDIMM | 16GB | — | PC4 Notch position = DDR4 generation | DDR3/DDR4/DDR5 physically incompatible RDIMM = Registered (servers) | LRDIMM = Load-Reduced | UDIMM = Unbuffered TITLE DDR4 RDIMM PN 867855-B21 MFR HPE 16GB —
KEY FEATURES
•
DDR4 Interface
•
16GB Capacity
•
DDR4 Memory
TYPICAL APPLICATIONS
  • Server memory expansion for virtualization workloads
  • Database performance optimization (in-memory computing)
  • VDI and remote desktop session hosting
  • High-performance computing (HPC) clusters
  • Mail server and collaboration platform scaling
  • Application server tier expansion
VERIFIED SUBSTITUTES & CROSS-REFERENCES 12
872970-001Compatible
HP 16Gb PC4-2666V-R ECC REG SR x4 CAS-19 DIMM Standard - Intel - G10
compatible
872837-091Compatible
HP 16Gb PC4-2666V-R ECC REG SR x4 CAS-19 DIMM Standard - Intel - G10
compatible
1XD85AACompatible
HP 16GB PC4-2666V-R ECC Reg Sr X4 Cas-19 Dimm - Intel - WS
compatible
1XD85ATCompatible
HP 16GB PC4-2666V-R ECC Reg Sr X4 Cas-19 Dimm - Intel - WS
compatible
815098-H21Compatible
HP 16Gb PC4-2666V-R ECC REG SR x4 CAS-19 DIMM - Intel - G10
compatible
815098-K21Compatible
HP 16Gb PC4-2666V-R ECC REG SR x4 CAS-19 DIMM - Intel - G10
compatible
LIFECYCLE
StatusUNKNOWN
Availability—
RoHS CompliantEAR99ESD SensitiveNot HAZMAT
THIS PART SUBSTITUTES FOR 2
872837-091SUBSTITUTE
HP 16Gb PC4-2666V-R ECC REG SR x4 CAS-19 DIMM Standard - Intel - G10
HPE
872970-001SUBSTITUTE
HP 16Gb PC4-2666V-R ECC REG SR x4 CAS-19 DIMM Standard - Intel - G10
HPE
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FREQUENTLY ASKED QUESTIONS
What is 867855-B21?
867855-B21 is a HP 867855B21 memory module 16 GB 1 x 16 GB DDR4 288-pin DIMM manufactured by HPE.
What parts can replace 867855-B21?
There are 12 known substitutes for 867855-B21: 872970-001, 872837-091, 1XD85AA and 9 more. Substitute compatibility should be verified for your specific system.
Is 867855-B21 still available?
867855-B21 is currently Unknown.
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Last verified: September 2026