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Technical Data Sheet
PartsTable / MEMORY / 450259-B21
450259-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 1GB, 800MHz, PC2-6400, DDR-2 ECC SDRAM

HP 1GB, 800MHz, PC2-6400, DDR-2 ECC SDRAM. This product is currently in active production with full OEM support. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5962-01-576-9444, 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→ 450259-B21
NSN: 5962-01-576-9444
FSC: 5962
CAGE: 28480 — HEWLETT-PACKARD COMPANY DBA HP (USA)
SPECIFICATIONS
Part Number450259-B21
ManufacturerHP
Capacity1GB
NSN5962-01-576-9444
COMPONENT DIAGRAM
ECC 1GB 2Rx4 PC4 — RDIMM HP NOTCH ~133.35 mm DDR4 RDIMM | 1GB | — | PC4 Notch position = DDR4 generation | DDR3/DDR4/DDR5 physically incompatible RDIMM = Registered (servers) | LRDIMM = Load-Reduced | UDIMM = Unbuffered TITLE DDR4 RDIMM PN 450259-B21 MFR HP 1GB —
KEY FEATURES
•
1GB Capacity
•
MEMORY DEVICE TYPE: RAM
•
MEMORY CAPACITY: 1GB GB
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 LENGTH4.500 INCHES NOMINAL IN
MEMORY DEVICE TYPERAM
OVERALL WIDTH1.000 INCHES NOMINAL IN
OVERALL HEIGHT7.000 INCHES NOMINAL IN
MEMORY CAPACITY1GB GB
VERIFIED SUBSTITUTES & CROSS-REFERENCES 2
459932-001Compatible
HP 1Gb PC2-6400E 800Mhz ECC UB DR x8 CL6 240-Pin DIMM - Intel
compatible
445166-051Compatible
HP 1Gb PC2-6400E 800Mhz ECC UB DR x8 CL6 240-Pin DIMM - Intel
compatible
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99ESD SensitiveNot HAZMAT
THIS PART SUBSTITUTES FOR 2
445166-051SUBSTITUTE
HP 1Gb PC2-6400E 800Mhz ECC UB DR x8 CL6 240-Pin (1x1Gb) Memory Kit - Intel
HPE
459932-001SUBSTITUTE
HP 1Gb PC2-6400E 800Mhz ECC UB DR x8 CL6 240-Pin (1x1Gb) Memory Kit - Intel
HPE
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FREQUENTLY ASKED QUESTIONS
What is 450259-B21?
450259-B21 is a HP 1GB, 800MHZ, Pc2-6400, Ddr-2 ECC Sdram manufactured by HP. It is classified as a MEMORY (RDIMM).
What parts can replace 450259-B21?
There are 2 known substitutes for 450259-B21: 459932-001, 445166-051. Substitute compatibility should be verified for your specific system.
What is the NSN for 450259-B21?
450259-B21 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5962-01-576-9444. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026