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99-S 1-2 — Memory Specs & Substitutes

✓ Verified by PartsTable
— · 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: Double-check what you're quoting in volatile market.
HOT market — DDR5/DDR4 extremely volatile
PRODUCT OVERVIEW

IBM 4GB (2 x 2GB DDR2) Main Storage. Key specifications include end_item_identification: COOPER/XCELITE SERIES 99 HANDLES, general_characteristics_item_description: STEEL; 3/8 IN. HEX SIZE; 1-3/8 IN.

LG IN. This part is cataloged in the Federal Logistics Information System under NSN 5120-00-056-3931, 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→ 99-S 1-2
NSN: 5120-00-056-3931
FSC: 5120
CAGE: 65LN0 — APEX TOOL GROUP, LLC (USA)
SPECIFICATIONS
end_item_identificationCOOPER/XCELITE SERIES 99 HANDLES
general_characteristics_item_descriptionSTEEL; 3/8 IN. HEX SIZE; 1-3/8 IN. LG IN
NSN5120-00-056-3931
COMPONENT DIAGRAM
ECC 4GB 2Rx4 PC4 — RDIMM OEM 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 99-S 1-2 MFR OEM 4GB —
KEY FEATURES
•
4GB Capacity
•
GENERAL CHARACTERISTICS ITEM DESCRIPTION: STEEL; 3/8 IN. HEX SIZE; 1-3/8 IN. LG IN
TECHNICAL CHARACTERISTICS
END ITEM IDENTIFICATIONCOOPER/XCELITE SERIES 99 HANDLES
GENERAL CHARACTERISTICS ITEM DESCRIPTIONSTEEL; 3/8 IN. HEX SIZE; 1-3/8 IN. LG IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 13
40R3HInterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
4475InterchangeableGOVERNMENT REGISTRY
IBM 4GB (2 x 2GB DDR2) Main Storage
interchangeable
J1403TYPEHWAInterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
48241REVAInterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
48241InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
20964InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLEDGOVERNMENT REGISTRY
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 99-S 1-2?
99-S 1-2 is a IBM 4GB (2 x 2GB DDR2) Main Storage. It is classified as a MEMORY (RDIMM).
What parts can replace 99-S 1-2?
There are 13 known substitutes for 99-S 1-2: 40R3H, 4475, J1403TYPEHWA and 10 more. Substitute compatibility should be verified for your specific system.
Is 99-S 1-2 still available?
99-S 1-2 is currently cancelled.
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Last verified: September 2026