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647899-B21 ✓ Verified by PartsTable
HP · MEMORY · RDIMM
WHAT YOU NEED TO KNOW
Memory is a hot market right now. DDR5 and DDR4 are extremely volatile with data centers driving availability to extreme lows. Always validate machine type and model. Remember: all RAM is Hynix, Samsung, or Micron underneath OEM labels — use that to find alternatives. Key checks: Check OEM alternatives — all RAM is Hynix/Samsung/Micron underneath. Double-check what you're quoting in volatile market.
HOT market — DDR5/DDR4 extremely volatile
PRODUCT OVERVIEW
HP 8GB 1X8GB PC3-12800R 1RX4 DIMM

HP 8GB 1X8GB PC3-12800R 1RX4 DIMM. Key specifications include Rank: Dual Rank (2R), Speed: DDR4-2666, Voltage: 1.2V, Capacity: 32GB, Form Factor: RDIMM, Organization: x4. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5998-01-623-0391, 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
MEMORY RDIMM 647899-B21
NSN: 5998-01-623-0391
FSC: 5998 — CIRCUIT CARD ASSEMBLY
CAGE: 28480 — HEWLETT-PACKARD COMPANY DBA HP (USA)
SPECIFICATIONS
RankDual Rank (2R)
SpeedDDR4-2666
Voltage1.2V
Capacity32GB
Form FactorRDIMM
Organizationx4
NSN5998-01-623-0391
COMPONENT DIAGRAM
ECC 8GB 2Rx4 PC4 RDIMM HP NOTCH ~133.35 mm DDR4 RDIMM | 8GB | — | PC4 Notch position = DDR4 generation | DDR3/DDR4/DDR5 physically incompatible RDIMM = Registered (servers) | LRDIMM = Load-Reduced | UDIMM = Unbuffered TITLE DDR4 RDIMM PN 647899-B21 MFR HP 8GB —
KEY FEATURES
8GB Capacity
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)
OVERALL WIDTH3.500 INCHES NOMINAL IN
OVERALL LENGTH7.800 INCHES NOMINAL IN
END ITEM IDENTIFICATIONCOMPUTER SERVER
SPECIAL FEATURESMEMORY SIZE: 8GB GB
PART NAME ASSIGNED BY CONTROLLING AGENCYRAM MODULE
OVERALL WIDTH3.500 INCHES NOMINAL IN
OVERALL LENGTH7.800 INCHES NOMINAL IN
END ITEM IDENTIFICATIONCOMPUTER SERVER
SPECIAL FEATURESMEMORY SIZE: 8GB GB
PART NAME ASSIGNED BY CONTROLLING AGENCYRAM MODULE
VERIFIED SUBSTITUTES & CROSS-REFERENCES 3
664691-001Compatible
HP 8Gb PC3-12800R 1600Mhz ECC REG SR x4 CAS-11 DIMM - Intel v1 - G8
compatible
647651-081Compatible
HP 8Gb PC3-12800R 1600Mhz ECC REG SR x4 CAS-11 DIMM - Intel v1 - G8
compatible
647651-08MCompatible
HP 8Gb PC3-12800R 1600Mhz ECC REG SR x4 CAS-11 DIMM - Intel v1 - G8
compatible
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99ESD SensitiveNot HAZMAT
THIS PART SUBSTITUTES FOR 3
647651-081SUBSTITUTE
HP 8Gb PC3-12800R 1600Mhz ECC REG SR x4 CAS-11 DIMM - Intel v1 - G8
HPE
647651-08MSUBSTITUTE
HP 8Gb PC3-12800R 1600Mhz ECC REG SR x4 CAS-11 DIMM - Intel v1 - G8
HPE
664691-001SUBSTITUTE
HP 8Gb PC3-12800R 1600Mhz ECC REG SR x4 CAS-11 DIMM - Intel v1 - G8
HPE
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FREQUENTLY ASKED QUESTIONS
What is 647899-B21?
647899-B21 is a HP 8GB 1x8gb Pc3-12800r 1Rx4 Dimm manufactured by HP. It is classified as a MEMORY (RDIMM).
What parts can replace 647899-B21?
There are 3 known substitutes for 647899-B21: 664691-001, 647651-081, 647651-08M. Substitute compatibility should be verified for your specific system.
What is the NSN for 647899-B21?
647899-B21 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5998-01-623-0391. This indicates validated use in U.S. government and defense supply chains.
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