128279-B21 — Memory Specs & Substitutes

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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

COMPAQ 512MB 1X512MB PC133 ECC DIMM. Key specifications include general_characteristics_item_description: REGISTERED ECC SDRAM DIMM MEMORY OPTION KIT; 512 MEGABYTE; 133 MEGAHERTZ. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 7025-01-484-7422, 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→ 128279-B21

NSN: 7025-01-484-7422
FSC: 7025
CAGE: 65685 — COMPAQ COMPUTER CORP. (USA)

SPECIFICATIONS

general_characteristics_item_description	REGISTERED ECC SDRAM DIMM MEMORY OPTION KIT; 512 MEGABYTE; 133 MEGAHERTZ
NSN	7025-01-484-7422

COMPONENT DIAGRAM

KEY FEATURES

•

512MB Capacity

•

GENERAL CHARACTERISTICS ITEM DESCRIPTION: REGISTERED ECC SDRAM DIMM MEMORY OPTION KIT; 512 MEGABYTE; 133 MEGAHERTZ

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)

GENERAL CHARACTERISTICS ITEM DESCRIPTION	REGISTERED ECC SDRAM DIMM MEMORY OPTION KIT; 512 MEGABYTE; 133 MEGAHERTZ
GENERAL CHARACTERISTICS ITEM DESCRIPTION	REGISTERED ECC SDRAM DIMM MEMORY OPTION KIT; 512 MEGABYTE; 133 MEGAHERTZ

VERIFIED SUBSTITUTES & CROSS-REFERENCES 1

159227-001Interchangeable

Same NIIN cross-reference

interchangeable

LIFECYCLE

StatusACTIVE

AvailabilityOEM and secondary market

RoHS CompliantEAR99ESD SensitiveNot HAZMATSourcing: other

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FREQUENTLY ASKED QUESTIONS

What is 128279-B21?

128279-B21 is a COMPAQ 512MB 1X512MB PC133 ECC DIMM manufactured by HP. It is classified as a MEMORY (RDIMM).

What parts can replace 128279-B21?

There is 1 known substitute for 128279-B21: 159227-001. Substitute compatibility should be verified for your specific system.

What is the NSN for 128279-B21?

128279-B21 is cataloged in the Federal Logistics Information System (FLIS) under NSN 7025-01-484-7422. This indicates validated use in U.S. government and defense supply chains.

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128279-B21 — Memory Specs & Substitutes

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