MEM-4400-4GU16G-RF — Cisco 4GB-to-16GB DRAM Memory Upgrade Kit (2x8GB), remanufactured, for ISR 4400 Series Routers (4431, 4451)
MPN: MEM-4400-4GU16G-RF|By: Cisco

In Stockships worldwide
- Condition:
- New — authorized channel
- Warranty:
- Full manufacturer warranty
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Product overview
The Cisco 4GB-to-16GB DRAM Memory upgrade Kit (2x8GB), remanufactured, for ISR 4400 series routers (4431, 4451) is supplied under part number MEM-4400-4GU16G-RF. Registered, load-reduced and unbuffered modules are not interchangeable, and a board that accepts one will refuse to post on another. Send the server model and we will check it against the supported-DIMM list before you order.
If the part is wrong for your platform we will say so and suggest the one that is, which is cheaper for both of us than a return.
Featuring
- Capacity
- 4GB
- Port Configuration
- 2x8GB
- Manufacturer
- Cisco
Physical characteristics
- Product Type
- Server Memory
- Expedited shipping options are available — rates confirmed with your quote.
- Purchase orders accepted from qualified institutions.
- Compatibility is validated against your server platform before dispatch. Send us the model and we will confirm support.
These are the 4 facts we can state about MEM-4400-4GU16G-RF without inferring anything. Compatibility beyond this is confirmed per platform, on request, before you order.
Where the Cisco MEM-4400-4GU16G-RF is deployed
- Swapping out a failed server memory module for MEM-4400-4GU16G-RF under change control
- Standardising a host on one module type and speed
- Replacing a DIMM flagged by correctable-error logging
Who this part is for
- Procurement buying memory kits against a documented configuration
- MSPs matching DIMMs to what a customer already has installed
- Teams retiring mixed-speed memory in favour of one consistent part
What you get ordering this from us
Ordered by part number
The order is placed against MEM-4400-4GU16G-RF, not against a description of it, so there is no room for a substitution you did not agree to.
Answered by a human
A quote comes back with the reasoning attached, including the cases where we think you should buy something else.
Rank and voltage confirmed
We check rank, voltage and module type against the platform before quoting, which is where most memory orders go wrong.
Questions buyers ask about this part
- Is MEM-4400-4GU16G-RF genuine and is the warranty intact?
- Yes — new and sealed, with the Cisco warranty and the firmware update path intact. We do not sell refurbished stock as new, and we do not source grey-market units.
- Will MEM-4400-4GU16G-RF work in my server?
- Send the server model and a list of the DIMMs already fitted. Rank, voltage and population order all have to agree, and a module that is electrically compatible can still be unsupported in a given slot. We map the population before you order.
- Do you accept purchase orders and quote at volume?
- Yes. We quote against a purchase order and hold the price for the quote period, with tiered rates at quantity. Net terms are available once the account is approved.
Compare other Server Memory we stock
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Specifying a system, not just the part?
Host memory on an AI node is normally sized against accelerator memory, so the model and its working set both fit.
