PartsTable
Technical Data Sheet
835955-B21 ✓ 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

The HP 16GB (1x16gb) 2Rx8 Pc4-21300V-R DDR4-2666MHZ RDIMM is a HP memory module engineered for enterprise server and workstation platforms requiring validated, high-reliability memory. This product is currently in active production with full OEM support. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 7025-01-694-5942, indicating validated use in U.S.

government and defense logistics supply chains. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels. Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
835955-B21
NSN: 7025-01-694-5942
FSC: 7025
CAGE: 7E6V7 — HEWLETT PACKARD ENTERPRISE CO DBA HEWLETT PACKARD ENTERPRISE CO DIV HEWLETT PACKARD ENTERPRISE COMPANY (USA)
SPECIFICATIONS
Part Number835955-B21
ManufacturerHP
InterfaceDDR4
Capacity16GB
Speed2666MHz
NSN7025-01-694-5942
COMPONENT DIAGRAM
ECC 16GB 2Rx4 PC4 2666MHz RDIMM HP NOTCH ~133.35 mm DDR4 RDIMM | 16GB | 2666MHz | PC4 Notch position = DDR4 generation | DDR3/DDR4/DDR5 physically incompatible RDIMM = Registered (servers) | LRDIMM = Load-Reduced | UDIMM = Unbuffered TITLE DDR4 RDIMM PN 835955-B21 MFR HP 16GB 2666MHz
KEY FEATURES
DDR4 Interface
16GB Capacity
2666MHz Speed
DDR4 RDIMM
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
TECHNICAL CHARACTERISTICS (FLIS)
PART NAME ASSIGNED BY CONTROLLING AGENCYREGISTERED SMART MEMORY KIT
PART NAME ASSIGNED BY CONTROLLING AGENCYREGISTERED SMART MEMORY KIT
VERIFIED SUBSTITUTES & CROSS-REFERENCES 12
868846-001Compatible
HP 16Gb PC4-2666V-R ECC REG DR x8 CAS-19 DIMM - Intel - G10
compatible
835955-H21Compatible
HP 16Gb PC4-2666V-R ECC REG DR x8 CAS-19 DIMM - Intel - G10
compatible
835955-K21Compatible
HP 16Gb PC4-2666V-R ECC REG DR x8 CAS-19 DIMM - Intel - G10
compatible
835955-X21Compatible
HP 16Gb PC4-2666V-R ECC REG DR x8 CAS-19 DIMM - Intel - G10
compatible
840756-091Compatible
HP 16Gb PC4-2666V-R ECC REG DR x8 CAS-19 DIMM - Intel - G10
compatible
840756-09MCompatible
HP 16Gb PC4-2666V-R ECC REG DR x8 CAS-19 DIMM - Intel - G10
compatible
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99ESD SensitiveNot HAZMAT
THIS PART SUBSTITUTES FOR 20
P00380-B21SUBSTITUTE
HP 16Gb PC4-2666V-R ECC REG DR x8 CAS-19 DIMM - Intel - G10
HPE
P01793-001SUBSTITUTE
HP 16Gb PC4-2666V-R ECC REG DR x8 CAS-19 DIMM - Intel - G10
HPE
P02890-B21SUBSTITUTE
HP 16Gb PC4-2666V-R ECC REG DR x8 CAS-19 DIMM - Intel - G10
HPE
P05588-B21SUBSTITUTE
HP 16Gb PC4-2666V-R ECC REG DR x8 CAS-19 DIMM - Intel - G10
HPE
P05588-H21SUBSTITUTE
HP 16Gb PC4-2666V-R ECC REG DR x8 CAS-19 DIMM - Intel - G10
HPE
P06184-001SUBSTITUTE
HP 16Gb PC4-2666V-R ECC REG DR x8 CAS-19 DIMM - Intel - G10
HPE
P07029-B21SUBSTITUTE
HP 16Gb PC4-2666V-R ECC REG DR x8 CAS-19 DIMM - Intel - G10
HPE
P08274-001SUBSTITUTE
HP 16Gb PC4-2666V-R ECC REG DR x8 CAS-19 DIMM - Intel - G10
HPE
P18444-B21SUBSTITUTE
HP 16Gb PC4-2666V-R ECC REG DR x8 CAS-19 DIMM - Intel - G10
HPE
835955-H21SUBSTITUTE
HP 16Gb PC4-2666V-R ECC REG DR x8 CAS-19 DIMM - Intel - G10
HPE
835955-K21SUBSTITUTE
HP 16Gb PC4-2666V-R ECC REG DR x8 CAS-19 DIMM - Intel - G10
HPE
835955-X21SUBSTITUTE
HP 16Gb PC4-2666V-R ECC REG DR x8 CAS-19 DIMM - Intel - G10
HPE
840756-091SUBSTITUTE
HP 16Gb PC4-2666V-R ECC REG DR x8 CAS-19 DIMM - Intel - G10
HPE
840756-09MSUBSTITUTE
HP 16Gb PC4-2666V-R ECC REG DR x8 CAS-19 DIMM - Intel - G10
HPE
840756-09SSUBSTITUTE
HP 16Gb PC4-2666V-R ECC REG DR x8 CAS-19 DIMM - Intel - G10
HPE
840756-C91SUBSTITUTE
HP 16Gb PC4-2666V-R ECC REG DR x8 CAS-19 DIMM - Intel - G10
HPE
840756-C9SSUBSTITUTE
HP 16Gb PC4-2666V-R ECC REG DR x8 CAS-19 DIMM - Intel - G10
HPE
840756-K91SUBSTITUTE
HP 16Gb PC4-2666V-R ECC REG DR x8 CAS-19 DIMM - Intel - G10
HPE
840756-V91SUBSTITUTE
HP 16Gb PC4-2666V-R ECC REG DR x8 CAS-19 DIMM - Intel - G10
HPE
868846-001SUBSTITUTE
HP 16Gb PC4-2666V-R ECC REG DR x8 CAS-19 DIMM - Intel - G10
HPE
Ready to buy 835955-B21?
Compare prices from verified sellers on eBay
Buy on eBay →
As an eBay Partner, PartsTable may earn a commission. Your price is not affected.
FREQUENTLY ASKED QUESTIONS
What is 835955-B21?
835955-B21 is a HP 16GB (1x16gb) 2Rx8 Pc4-21300V-R DDR4-2666MHZ RDIMM manufactured by HP.
What parts can replace 835955-B21?
There are 12 known substitutes for 835955-B21: 868846-001, 835955-H21, 835955-K21 and 9 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 835955-B21?
835955-B21 is cataloged in the Federal Logistics Information System (FLIS) under NSN 7025-01-694-5942. This indicates validated use in U.S. government and defense supply chains.
Community Feedback
Comments (0)
Loading comments...
Leave a Comment
Comments are reviewed before appearing. You will receive an email to verify before your comment appears.

Need a quote for 835955-B21?