Cisco 400GB Internal SSD for ISR 4451
NIM-SSD-400G
SSD0MHz400GBmSATA
RAM for Cisco ISR 4451-X (ISR4451-X/K9)
Model Years: 2013–2022
Max RAM: 16GBRAM Slots: 1RAM Type: DDR3 DRAM 1600MHz
⚠ Single Slot — Limited Upgrade
Quick answer
Our data matches the Cisco ISR 4451-X (ISR4451-X/K9) with Cisco 400GB Internal SSD for ISR 4451 (SSD, mSATA, 0MHz, 400GB); Cisco 16GB DDR4 DRAM for ISR 4431 (DDR4 DRAM, DDR4 DIMM, 2133MHz, 16GB); Cisco 16GB Flash for ISR 4451 (Flash, CompactFlash, 0MHz, 16GB), plus 6 more options listed below.
Supported memory profile: DDR3 DRAM, mSATA, 1600MHz, up to 16GB max, 1 slot.
Before buying, confirm your exact model number, memory generation, form factor (mSATA), speed, and maximum supported capacity. Live eBay listings are shown below and may change.
Compatible RAM for the Cisco ISR 4451-X
Listings and prices are pulled from eBay and may change. Always verify compatibility before purchase. Listings are updated daily.
HIGH
Cisco 16GB DDR4 DRAM for ISR 4431
MEM-4400-16G
DDR4 DRAM2133MHz16GBDDR4 DIMM
Cisco 16GB Flash for ISR 4451
MEM-4400-16G-FLSH
Flash0MHz16GBCompactFlash
Cisco 8GB DDR4 DRAM for ISR 4431
MEM-4400-8G
DDR4 DRAM2133MHz8GBDDR4 DIMM
Cisco 8GB DDR4 DRAM for ISR 4431
5 listings
Cisco 8GB Flash for ISR 4431
MEM-4400-8G-FLSH
Flash0MHz8GBCompactFlash
Kingston 16GB DDR3 DRAM for Cisco ISR 4331
KCS-SP316/16G
DDR3 DRAM1600MHz16GBCisco DRAM Module
Kingston 8GB DDR3 for ISR 4451
KCS-SP316/8G
DDR3 DRAM1600MHz8GBCisco DRAM Module
Crucial 8GB DDR3 DRAM for Cisco ISR
CT8G3ERSLD8160B
DRAM1600MHz8GBCisco DRAM Module
Crucial 8GB DDR3 DRAM for Cisco ISR
10 listings
SanDisk 8GB DDR3 for Cisco
SD3-8GB-CISCO
DDR3 DRAM1600MHz8GBCisco DRAM Module
SanDisk 8GB DDR3 for Cisco
4 listings
Frequently Asked Questions
What RAM fits the Cisco ISR 4451-X (ISR4451-X/K9)?
Based on our compatibility data, the Cisco ISR 4451-X (ISR4451-X/K9) supports DDR3 DRAM, mSATA, 1600MHz, up to 16GB max, 1 slot. Matched modules include Cisco 400GB Internal SSD for ISR 4451 (SSD, mSATA, 0MHz, 400GB); Cisco 16GB DDR4 DRAM for ISR 4431 (DDR4 DRAM, DDR4 DIMM, 2133MHz, 16GB); Cisco 16GB Flash for ISR 4451 (Flash, CompactFlash, 0MHz, 16GB); Cisco 8GB DDR4 DRAM for ISR 4431 (DDR4 DRAM, DDR4 DIMM, 2133MHz, 8GB); Cisco 8GB Flash for ISR 4431 (Flash, CompactFlash, 0MHz, 8GB); Kingston 16GB DDR3 DRAM for Cisco ISR 4331 (DDR3 DRAM, Cisco DRAM Module, 1600MHz, 16GB); Kingston 8GB DDR3 for ISR 4451 (DDR3 DRAM, Cisco DRAM Module, 1600MHz, 8GB); Crucial 8GB DDR3 DRAM for Cisco ISR (DRAM, Cisco DRAM Module, 1600MHz, 8GB); SanDisk 8GB DDR3 for Cisco (DDR3 DRAM, Cisco DRAM Module, 1600MHz, 8GB). Always confirm your exact model number before purchasing.
How do I verify RAM compatibility?
Check that your device label or manual shows ISR4451-X/K9 (or ISR 4451-X). Confirm memory generation, form factor (mSATA), speed, slot count, and maximum supported capacity match the specs on this page before ordering.
Can I mix RAM speeds or capacities?
This device has a single RAM slot, so you typically replace the existing module rather than adding a second stick. Match the supported generation, form factor, and maximum module capacity.
Are these listings live and current?
Current eBay listings for compatible RAM modules are shown below. Prices and availability change frequently — verify listing details and seller ratings before you buy.
RAM Upgrade Guide for the Cisco ISR 4451-X
This device uses DDR3 DRAM at 1600MHz. Maximum supported capacity is 16GB.
This model has a single RAM slot. Maximum capacity is 16GB.
Always power off and unplug your device before installing RAM. Ground yourself to avoid static discharge.