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77P6500 ✓ Verified by PartsTable
IBM · 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
IBM 4 GB 667 MHz RDIMM

The IBM 4 GB 667 Mhz RDIMM is a IBM 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 7025-01-576-3687, 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→ 77P6500
NSN: 7025-01-576-3687
FSC: 7025
CAGE: 30874 — INTERNATIONAL BUSINESS MACHINES CORPORATION DBA IBM (USA)
SPECIFICATIONS
Part Number77P6500
ManufacturerIBM
Capacity4GB
NSN7025-01-576-3687
COMPONENT DIAGRAM
ECC 4GB 2Rx4 PC4 — RDIMM IBM NOTCH ~133.35 mm DDR4 RDIMM | 4GB | — | PC4 Notch position = DDR4 generation | DDR3/DDR4/DDR5 physically incompatible RDIMM = Registered (servers) | LRDIMM = Load-Reduced | UDIMM = Unbuffered TITLE DDR4 RDIMM PN 77P6500 MFR IBM 4GB —
KEY FEATURES
•
4GB 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)
END ITEM IDENTIFICATIONATOPS
SPECIAL FEATURES8192MB (2X4096MB) RDIMMS, 667 MHZ, 512MB DRAM MB
END ITEM IDENTIFICATIONATOPS
SPECIAL FEATURES8192MB (2X4096MB) RDIMMS, 667 MHZ, 512MB DRAM MB
VERIFIED SUBSTITUTES & CROSS-REFERENCES 1
40Y0641Compatible
IBM 8Gb PC2-5300R 667Mhz ECC REG DR x4 CL5 240-Pin (2x4Gb) Memory Kit - Option
compatible
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99ESD SensitiveNot HAZMAT
THIS PART SUBSTITUTES FOR 1
40Y0641SUBSTITUTE
IBM 4Gb PC2-5300R 667Mhz ECC REG DR x4 CL5 240-Pin DIMM - FRU
IBM
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FREQUENTLY ASKED QUESTIONS
What is 77P6500?
77P6500 is a IBM 4 GB 667 Mhz RDIMM manufactured by IBM. It is classified as a MEMORY (RDIMM).
What parts can replace 77P6500?
There is 1 known substitute for 77P6500: 40Y0641. Substitute compatibility should be verified for your specific system.
What is the NSN for 77P6500?
77P6500 is cataloged in the Federal Logistics Information System (FLIS) under NSN 7025-01-576-3687. 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.
Last verified: July 2026