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A5B8 ✓ 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

Memory offerings let you upgrade your system's standard memory capacity to improve overall PC system performance. Adding additional memory is a cost-effective way to help boost your system's performance and enhance its ability to run more programs simultaneously. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 3120-00-661-4971, 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→ A5B8
NSN: 3120-00-661-4971
FSC: 3120
CAGE: 63097 — VIKING PUMP, INC (USA)
SPECIFICATIONS
Part NumberA5B8
ManufacturerIBM
NSN3120-00-661-4971
COMPONENT DIAGRAM
ECC — 2Rx4 PC4 — RDIMM IBM NOTCH ~133.35 mm DDR4 RDIMM | — | — | PC4 Notch position = DDR4 generation | DDR3/DDR4/DDR5 physically incompatible RDIMM = Registered (servers) | LRDIMM = Load-Reduced | UDIMM = Unbuffered TITLE DDR4 RDIMM PN A5B8 MFR IBM — —
KEY FEATURES
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BODY OUTSIDE DIAMETER: 1.3140 INCHES MINIMUM AND 1.3150 INCHES MAXIMUM IN
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CORNER SHAPE: SQUARE ALL CORNERS
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MATERIAL DOCUMENT AND CLASSIFICATION: QQ-B-691,COMP 7 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
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STYLE DESIGNATOR: SOLID, PLAIN, NO OUTSIDE FLANGES
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MATERIAL: COPPER ALLOY OVERALL
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SURFACE GROOVE LOCATION AND QUANTITY: 1 INTERNAL
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BODY INSIDE DIAMETER: 0.9400 INCHES MINIMUM AND 0.9410 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
BODY OUTSIDE DIAMETER1.3140 INCHES MINIMUM AND 1.3150 INCHES MAXIMUM IN
OVERALL LENGTH0.8750 INCHES NOMINAL IN
CORNER SHAPESQUARE ALL CORNERS
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-B-691,COMP 7 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
STYLE DESIGNATORSOLID, PLAIN, NO OUTSIDE FLANGES
MATERIALCOPPER ALLOY OVERALL
SURFACE GROOVE LOCATION AND QUANTITY1 INTERNAL
BODY INSIDE DIAMETER0.9400 INCHES MINIMUM AND 0.9410 INCHES MAXIMUM IN
LUBRICANT ACCOMMODATION STYLEGROOVED OPEN BOTH ENDS
VERIFIED SUBSTITUTES & CROSS-REFERENCES

No verified substitutes available.

LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is A5B8?
A5B8 is a A5B8 manufactured by IBM. It is classified as a MEMORY (RDIMM).
What is the NSN for A5B8?
A5B8 is cataloged in the Federal Logistics Information System (FLIS) under NSN 3120-00-661-4971. 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