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857555-B21 — Memory Specs & Substitutes

✓ Verified by PartsTable
HP · 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 8Gb PC4-2133P-R ECC REG SR x4 CAS-15 DIMM - Intel - WS. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels. Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
857555-B21
SPECIFICATIONS
Part Number857555-B21
ManufacturerHP
Capacity8GB
Speed2133MHz
COMPONENT DIAGRAM
ECC 8GB 2Rx4 PC4 2133MHz RDIMM HP NOTCH ~133.35 mm DDR4 RDIMM | 8GB | 2133MHz | PC4 Notch position = DDR4 generation | DDR3/DDR4/DDR5 physically incompatible RDIMM = Registered (servers) | LRDIMM = Load-Reduced | UDIMM = Unbuffered TITLE DDR4 RDIMM PN 857555-B21 MFR HP 8GB 2133MHz
KEY FEATURES
•
8GB Capacity
•
2133MHz Speed
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
726718-B21Compatible
HP 8Gb PC4-2133P-R ECC REG SR x4 CAS-15 DIMM - Intel v3 - G9
compatible
774170-001Compatible
HP 8Gb PC4-2133P-R ECC REG SR x4 CAS-15 DIMM - Intel v3 - G9
compatible
752368-081Compatible
HP 8Gb PC4-2133P-R ECC REG SR x4 CAS-15 DIMM - Intel v3 - G9
compatible
752368-08SCompatible
HP 8Gb PC4-2133P-R ECC REG SR x4 CAS-15 DIMM - Intel v3 - G9
compatible
752368-281Compatible
HP 8Gb PC4-2133P-R ECC REG SR x4 CAS-15 DIMM - Intel v3 - G9
compatible
752368-581Compatible
HP 8GB PC4-2133P-R ECC Reg Sr X4 Cas-15 Dimm - Intel - WS
compatible
LIFECYCLE
StatusUNKNOWN
Availability—
RoHS CompliantEAR99ESD SensitiveNot HAZMAT
THIS PART SUBSTITUTES FOR 20
J9P82AASUBSTITUTE
HP 8Gb PC4-2133P-R ECC REG SR x4 CAS-15 DIMM - Intel v3 - Cloudline
HPE
J9P82ATSUBSTITUTE
HP 8Gb PC4-2133P-R ECC REG SR x4 CAS-15 DIMM - Intel v3 - Cloudline
HPE
726718-B21SUBSTITUTE
HP 8Gb PC4-2133P-R ECC REG SR x4 CAS-15 DIMM - Intel v3 - Cloudline
HPE
752368-081SUBSTITUTE
HP 8Gb PC4-2133P-R ECC REG SR x4 CAS-15 DIMM - Intel v3 - Cloudline
HPE
752368-08SSUBSTITUTE
HP 8Gb PC4-2133P-R ECC REG SR x4 CAS-15 DIMM - Intel v3 - Cloudline
HPE
752368-281SUBSTITUTE
HP 8Gb PC4-2133P-R ECC REG SR x4 CAS-15 DIMM - Intel v3 - Cloudline
HPE
752368-581SUBSTITUTE
HP 8Gb PC4-2133P-R ECC REG SR x4 CAS-15 DIMM - Intel v3 - Cloudline
HPE
752368-M81SUBSTITUTE
HP 8Gb PC4-2133P-R ECC REG SR x4 CAS-15 DIMM - Intel v3 - Cloudline
HPE
753220-201SUBSTITUTE
HP 8Gb PC4-2133P-R ECC REG SR x4 CAS-15 DIMM - Intel v3 - Cloudline
HPE
753220-B21SUBSTITUTE
HP 8Gb PC4-2133P-R ECC REG SR x4 CAS-15 DIMM - Intel v3 - Cloudline
HPE
774170-001SUBSTITUTE
HP 8Gb PC4-2133P-R ECC REG SR x4 CAS-15 DIMM - Intel v3 - Cloudline
HPE
787864-B21SUBSTITUTE
HP 8Gb PC4-2133P-R ECC REG SR x4 CAS-15 DIMM - Intel v3 - Cloudline
HPE
790109-001SUBSTITUTE
HP 8Gb PC4-2133P-R ECC REG SR x4 CAS-15 DIMM - Intel v3 - Cloudline
HPE
803028-B21SUBSTITUTE
HP 8Gb PC4-2133P-R ECC REG SR x4 CAS-15 DIMM - Intel v3 - Cloudline
HPE
803656-081SUBSTITUTE
HP 8Gb PC4-2133P-R ECC REG SR x4 CAS-15 DIMM - Intel v3 - Cloudline
HPE
804843-001SUBSTITUTE
HP 8Gb PC4-2133P-R ECC REG SR x4 CAS-15 DIMM - Intel v3 - Cloudline
HPE
807816-B21SUBSTITUTE
HP 8Gb PC4-2133P-R ECC REG SR x4 CAS-15 DIMM - Intel v3 - Cloudline
HPE
817545-081SUBSTITUTE
HP 8Gb PC4-2133P-R ECC REG SR x4 CAS-15 DIMM - Intel v3 - Cloudline
HPE
847830-B21SUBSTITUTE
HP 8Gb PC4-2133P-R ECC REG SR x4 CAS-15 DIMM - Intel v3 - Cloudline
HPE
850084-001SUBSTITUTE
HP 8Gb PC4-2133P-R ECC REG SR x4 CAS-15 DIMM - Intel v3 - Cloudline
HPE
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FREQUENTLY ASKED QUESTIONS
What is 857555-B21?
857555-B21 is a HP 8Gb PC4-2133P-R ECC REG SR x4 CAS-15 DIMM - Intel - WS manufactured by HP.
What parts can replace 857555-B21?
There are 12 known substitutes for 857555-B21: 726718-B21, 774170-001, 752368-081 and 9 more. Substitute compatibility should be verified for your specific system.
Is 857555-B21 still available?
857555-B21 is currently Unknown.
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PartsTable Design LLC · partstable.com
Last verified: September 2026