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PartsTable / MEMORY / ISR4451-X/K9

ISR4451-X/K9 — Memory Specs & Substitutes

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CISCO · 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
Cisco ISR 4451 (4GE,3NIM,2SM,8G FLASH,4G DRAM)

Cisco ISR 4451 (4GE,3NIM,2SM,8G FLASH,4G DRAM). Key specifications include UNIT DESIGN: DESK TOP, CURRENT TYPE: AC/DC, WATTAGE RATING IN WATTS: 500.0 MAXIMUM, PART NAME ASSIGNED BY CONTROLLING AGENCY: INTEGRATED SERVICES ROUTER. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 7025-01-644-6649, 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→ ISR4451-X/K9
NSN: 7025-01-644-6649
FSC: 7025
CAGE: 0GX96 — CISCO SYSTEMS INC (USA)
SPECIFICATIONS
UNIT DESIGNDESK TOP
CURRENT TYPEAC/DC
WATTAGE RATING IN WATTS500.0 MAXIMUM
PART NAME ASSIGNED BY CONTROLLING AGENCYINTEGRATED SERVICES ROUTER
NSN7025-01-644-6649
COMPONENT DIAGRAM
ECC — 2Rx4 PC4 — RDIMM CISCO 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 ISR4451-X/K9 MFR CISCO — —
KEY FEATURES
•
CURRENT TYPE: AC/DC
•
UNIT DESIGN: DESK TOP
•
WATTAGE RATING IN WATTS: 500.0 MAXIMUM
TECHNICAL CHARACTERISTICS (FLIS)
PART NAME ASSIGNED BY CONTROLLING AGENCYINTEGRATED SERVICES ROUTER
CURRENT TYPEAC/DC
UNIT DESIGNDESK TOP
WATTAGE RATING IN WATTS500.0 MAXIMUM
PART NAME ASSIGNED BY CONTROLLING AGENCYINTEGRATED SERVICES ROUTER
CURRENT TYPEAC/DC
UNIT DESIGNDESK TOP
WATTAGE RATING IN WATTS500.0 MAXIMUM
VERIFIED SUBSTITUTES & CROSS-REFERENCES 5
DAP-1650Interchangeable
interchangeable cross-reference
interchangeable
788538014Interchangeable
interchangeable cross-reference
interchangeable
2149888Interchangeable
interchangeable cross-reference
interchangeable
2862749Interchangeable
interchangeable cross-reference
interchangeable
SCNC-ACS-4450-FANASSYInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99ESD SensitiveNot HAZMATSourcing: other
RELATED PARTS 6
C2901-AX/K9
Cisco 2901 wired router Gigabit Ethernet Black
C3850-NM-4-1G
Cisco Catalyst 3850 4 x 1GE Network Module
C3KX-NM-1G
Cisco Network Module for Catalyst 3560-X/3750-X
GLC-FE-100FX=
CISCO 100BASE-FX SFP for FE port
C9300-NM-8X
CISCO Catalyst 9300 8 x 10GE Network Module
C3850-NM-2-10G
CISCO CAT3850 4-1GE/2-10GE Network Module
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FREQUENTLY ASKED QUESTIONS
What is ISR4451-X/K9?
ISR4451-X/K9 is a Cisco Isr 4451 (4ge,3nim,2sm,8g Flash,4g Dram) manufactured by CISCO. It is classified as a MEMORY (RDIMM).
What parts can replace ISR4451-X/K9?
There are 5 known substitutes for ISR4451-X/K9: DAP-1650, 788538014, 2149888 and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for ISR4451-X/K9?
ISR4451-X/K9 is cataloged in the Federal Logistics Information System (FLIS) under NSN 7025-01-644-6649. 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