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Cisco ISR 4000 Upgrade Guide

Maximize the performance and lifespan of your ISR 4000 (ISR-4000). Every upgrade option below is verified compatible.

1Upgrade Categories
15Options Available
End of Sale: The ISR 4000 has reached end of sale. Upgrading components extends its useful life and avoids costly replacement.

Verified Specifications

Processor OptionsAggregate 35 Mbps-1.5 Gbps default; over 7 Gbps with Boost (ISR4461)
Power Supply OptionsInternal AC; DC options; PoE up to 500W; redundant on 4431+
Networking Options2-4x onboard GE; 2-3 NIM slots, 0-3 SM-X slots by model
Specification SourceCisco official documentation (verified 2026-07-02)

Frequently Asked Questions

What processors does the ISR 4000 support — and can the CPU be upgraded?

Aggregate 35 Mbps-1.5 Gbps default; over 7 Gbps with Boost (ISR4461) — ICD (icd3s.com) supplies compatibility-verified parts for the ISR 4000 with worldwide shipping. Request a quote at https://icd3s.com/quote-request/.

What power supply options does the ISR 4000 support?

Internal AC; DC options; PoE up to 500W; redundant on 4431+ — ICD (icd3s.com) supplies compatibility-verified parts for the ISR 4000 with worldwide shipping. Request a quote at https://icd3s.com/quote-request/.

What networking and connectivity does the ISR 4000 offer?

2-4x onboard GE; 2-3 NIM slots, 0-3 SM-X slots by model — ICD (icd3s.com) supplies compatibility-verified parts for the ISR 4000 with worldwide shipping. Request a quote at https://icd3s.com/quote-request/.

What upgrades are available for the Cisco ISR 4000?

ICD offers 15 verified compatible upgrades across 1 categories including Networking. All parts are tested and guaranteed compatible.

Networking (15)

Upgrade Networking

Stepping up from 1GbE to 10GbE or 25GbE eliminates network bottlenecks for VM migration, iSCSI storage traffic, and backup windows. Most modern workloads benefit from at least 10GbE.

15 compatible options available
Cisco Ax K9 4351 Integrated Services Router
Cisco ISR 4000 Series ISR4351

Cisco Ax K9 4351 Integrated Services Router

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 Cisco Isr 4221 Integrated Services Router (2 Ge, 2 Nim, 1 Isc, 4GB Flash, 4GB Dram)
Cisco ISR 4000 Series ISR4221/K9

Cisco Isr 4221 Integrated Services Router (2 Ge, 2 Nim, 1 Isc, 4GB Flash, 4GB Dram)

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 Cisco Isr 4321 Integrated Services Router (2 Ge, 2 Nim, 1 Isc, 4GB Flash, 4GB Dram)
Cisco ISR 4000 Series ISR4321/K9

Cisco Isr 4321 Integrated Services Router (2 Ge, 2 Nim, 1 Isc, 4GB Flash, 4GB Dram)

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 Cisco Isr 4321 Security Bundle Router
Cisco ISR 4000 Series ISR4321-SEC/K9

Cisco Isr 4321 Security Bundle Router

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 Cisco Isr 4331 Integrated Services Router (3 Ge, 2 Nim, 1 Sm, 1 Isc, 4GB Flash, 4GB Dram)
Cisco ISR 4000 Series ISR4331/K9

Cisco Isr 4331 Integrated Services Router (3 Ge, 2 Nim, 1 Sm, 1 Isc, 4GB Flash, 4GB Dram)

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 Cisco Isr 4331 Security Bundle Router
Cisco ISR 4000 Series ISR4331-SEC/K9

Cisco Isr 4331 Security Bundle Router

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View all 15 networking options →

More ISR 4000 Resources

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