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EM64 — Memory Specs & Substitutes

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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 64GB DDR4 2666MHZ RDIMM MEMORY P9

IBM 64GB DDR4 2666MHZ RDIMM MEMORY P9. This product is currently in active production with full OEM support. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5998-01-310-9181, 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→ EM64
NSN: 5998-01-310-9181
FSC: 5998 — CIRCUIT CARD ASSEMBLY
CAGE: 29899 — CALGON CARBON UV TECHNOLOGIES LLC DBA HYDE MARINE (USA)
SPECIFICATIONS
Part NumberEM64
ManufacturerIBM
InterfaceDDR4
Capacity64GB
Speed2666MHz
NSN5998-01-310-9181
COMPONENT DIAGRAM
ECC 64GB 2Rx4 PC4 2666MHz RDIMM IBM NOTCH ~133.35 mm DDR4 RDIMM | 64GB | 2666MHz | PC4 Notch position = DDR4 generation | DDR3/DDR4/DDR5 physically incompatible RDIMM = Registered (servers) | LRDIMM = Load-Reduced | UDIMM = Unbuffered TITLE DDR4 RDIMM PN EM64 MFR IBM 64GB 2666MHz
KEY FEATURES
•
DDR4 Interface
•
64GB 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
VERIFIED SUBSTITUTES & CROSS-REFERENCES 6
1332513Interchangeable
interchangeable cross-reference
interchangeable
EL58Interchangeable
interchangeable cross-reference
interchangeable
25379 ITEM 16Interchangeable
Same NIIN cross-reference
interchangeable
78P4199Primary
IBM 64GB DDR4 2666MHZ RDIMM Memory P9
primary
325APrimary
IBM 64GB DDR4 2666MHZ RDIMM Memory P9
primary
EM-64-1Interchangeable
IBM 64GB DDR4 2666MHZ RDIMM Memory P9
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99ESD SensitiveNot HAZMATSourcing: other
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FREQUENTLY ASKED QUESTIONS
What is EM64?
EM64 is a IBM 64GB DDR4 2666MHZ RDIMM Memory P9 manufactured by IBM. It is classified as a MEMORY (RDIMM).
What parts can replace EM64?
There are 6 known substitutes for EM64: 1332513, EL58, 25379 ITEM 16 and 3 more. Substitute compatibility should be verified for your specific system.
What is the NSN for EM64?
EM64 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5998-01-310-9181. 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: September 2026