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PartsTable / MEMORY / EL58

EL58 — Memory Specs & Substitutes

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— · 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. Key specifications include material: COPPER ALLOY 932 OVERALL, corner_shape: SQUARE LEFT FLANGE OUTSIDE RIGHT CORNER, flange_width: 0.4375 INCHES NOMINAL IN, overall_length: 3.1250 INCHES NOMINAL IN, style_designator: SOLID, EXTERNAL FLANGE ONE END, body_inside_diameter: 1.2500 INCHES NOMINAL IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 3120-00-419-1569, 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→ EL58
NSN: 3120-00-419-1569
FSC: 3120
CAGE: 71366 — BUNTING BEARINGS CORP (USA)
SPECIFICATIONS
materialCOPPER ALLOY 932 OVERALL
corner_shapeSQUARE LEFT FLANGE OUTSIDE RIGHT CORNER
flange_width0.4375 INCHES NOMINAL IN
overall_length3.1250 INCHES NOMINAL IN
style_designatorSOLID, EXTERNAL FLANGE ONE END
body_inside_diameter1.2500 INCHES NOMINAL IN
body_outside_diameter1.6875 INCHES NOMINAL IN
flange_outside_diameter1.7500 INCHES NOMINAL IN
material_document_and_classificationSAE ASSN STD SINGLE MATERIAL RESPONSE OVERALL
antirotation/lubrication_type_and_quantity1 SLOT
NSN3120-00-419-1569
COMPONENT DIAGRAM
ECC 64GB 2Rx4 PC4 2666MHz RDIMM OEM 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 EL58 MFR OEM 64GB 2666MHz
KEY FEATURES
•
DDR4 Interface
•
64GB Capacity
•
2666MHz Speed
•
DDR4 RDIMM
•
BODY OUTSIDE DIAMETER: 1.6875 INCHES NOMINAL IN
•
ANTIROTATION/LUBRICATION TYPE AND QUANTITY: 1 SLOT
•
MATERIAL DOCUMENT AND CLASSIFICATION: SAE ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
CORNER SHAPE: CHAMFERED INSIDE RIGHT CORNER
•
BODY INSIDE DIAMETER: 1.2500 INCHES NOMINAL IN
•
MATERIAL: COPPER ALLOY 932 OVERALL
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 LENGTH3.1250 INCHES NOMINAL IN
BODY OUTSIDE DIAMETER1.6875 INCHES NOMINAL IN
ANTIROTATION/LUBRICATION TYPE AND QUANTITY1 SLOT
MATERIAL DOCUMENT AND CLASSIFICATIONSAE ASSN STD SINGLE MATERIAL RESPONSE OVERALL
CORNER SHAPECHAMFERED INSIDE RIGHT CORNER
BODY INSIDE DIAMETER1.2500 INCHES NOMINAL IN
MATERIALCOPPER ALLOY 932 OVERALL
FLANGE WIDTH0.4375 INCHES NOMINAL IN
CORNER SHAPESQUARE OUTSIDE LEFT CORNER
CORNER SHAPEUNDERCUT LEFT FLANGE BODY CORNER
VERIFIED SUBSTITUTES & CROSS-REFERENCES 6
25379 ITEM 16Interchangeable
interchangeable cross-reference
interchangeable
EM-64-1Interchangeable
interchangeable cross-reference
interchangeable
EM-64Interchangeable
IBM 64GB DDR4 2666MHZ RDIMM Memory P9
interchangeable
1332224Interchangeable
Same NIIN cross-reference
interchangeable
3920847Interchangeable
Same NIIN cross-reference
interchangeable
1332513Interchangeable
IBM 64GB DDR4 2666MHZ RDIMM Memory P9
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is EL58?
EL58 is a IBM 64GB DDR4 2666MHZ RDIMM MEMORY P9. It is classified as a MEMORY (RDIMM).
What parts can replace EL58?
There are 6 known substitutes for EL58: 25379 ITEM 16, EM-64-1, EM-64 and 3 more. Substitute compatibility should be verified for your specific system.
What is the NSN for EL58?
EL58 is cataloged in the Federal Logistics Information System (FLIS) under NSN 3120-00-419-1569. 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.
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Last verified: September 2026