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Ethan Collins
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Memory upgrade significantly boosted ISR 2951 capacity.
MEM-2951-512U2.5GB
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512MB to 2.5GB DRAM Upgrade (2GB+512MB) for Cisco 2951 ISR
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MEM-2951-512U2.5GB
- Description:
- 512MB to 2.5GB DRAM Upgrade (2GB+512MB) for Cisco 2951 ISR
- Rating:
Added to cart 28 times recently
- Availability:
In stock - Ready to Ship
- Brand:
- Cisco
- Condition:
- Warranty:
- 3
- List Price:
$750.00
- Price:
$361.0051.9% off
Quantity:
1
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MEM-2951-512U2.5GB Overview
MEM-2951-512U2.5GB is a high-performance DDR4 UDIMM memory module designed to deliver fast and reliable performance with a speed of 3200 MHz and a CAS latency of CL16. Manufactured to operate at 1.35V, this module offers a substantial capacity of 512 GB configured as a single channel kit, ensuring robust support for demanding desktop environments.
Engineered without ECC and utilizing an unbuffered architecture, MEM-2951-512U2.5GB is optimized for desktop builds that require efficient thermal management, thanks to its integrated heatspreader. It does not feature RGB lighting, making it ideal for gaming-oriented systems as well as high-performance workstations where stability and streamlined design are a priority.
MEM-2951-512U2.5GB price is $361.00, a 51.9% saving from the Cisco list price of $750.00. MEM-2951-512U2.5GB is in stock and available for next-day dispatch. (terms applied)
Request bulk order quote for MEM-2951-512U2.5GB for additional pricing. Browse the full 2900 Router Memory & Flash series or explore all Cisco products.
MEM-2951-512U2.5GB Specifications
- Product Type
- Computer Memory
- Memory Type
- DDR4
- Capacity
- 512 GB
- Compatible Platforms
- Desktop
- Compatible Systems
- N/A
- Form Factor
- UDIMM
- Kit Configuration
- Single Channel
- Speed
- 3200 MHz
- Operating Temperature
- N/A
- Reliability Rating
- Standard
- CAS Latency (CL)
- CL16
- Voltage
- 1.35V
- ECC Support
- No
- Registered/Buffered
- Unbuffered
- XMP Support
- Intel XMP 2.0
- RGB Lighting
- No
- Heatsink / Heatspreader
- Yes
- Intel Platform Support
- Intel 12th Gen
- AMD Platform Support
- AMD Ryzen 5000
- Use Case
- Gaming
- Product Name
- MEM-2951-512U2.5GB
- Height
- 1.2 inches
- Width
- 5.3 inches
- Depth
- 0.6 inches
- Weight
- 0.2 lbs
Quality Certifications
To get the detailed certification, please go to the Compliance Center.
Product Comparison Table 
| MEM-2951-512U2.5GB |  MEM-2900-1GB= |  MEM-2951-512U1.5GB |  MEM-2900-512U1GB |  MEM-2951-512U4GB | |
|---|---|---|---|---|---|
| Product Type | Computer Memory | Computer Memory | Computer Memory | Computer Memory | Computer Memory |
| Memory Type | DDR4 | DDR3 | DDR4 | DDR4 | DDR4 |
| Capacity | 512 GB | 1 GB | 512 GB | 512 GB | 4 GB |
| Compatible Platforms | Desktop | Desktop | Desktop / Laptop / Server | Desktop / Server | Desktop / Laptop / Server |
| Compatible Systems | N/A | N/A | Workstation | N/A | Workstation |
| Form Factor | UDIMM | UDIMM | UDIMM | UDIMM | UDIMM |
| Kit Configuration | Single Channel | Single Channel | Single Channel | Single Channel | Single Channel |
| Speed | 3200 MHz | 1600 MHz | 3200 MHz | 2900 MHz | 3200 MHz |
| Operating Temperature | N/A | N/A | N/A | N/A | N/A |
| Reliability Rating | Standard | Standard | Standard | Standard | Standard |
| CAS Latency (CL) | CL16 | CL11 | CL16 | CL16 | CL16 |
| Voltage | 1.35V | 1.5V | 1.35V | 1.35V | 1.35V |
| ECC Support | No | No | No | No | No |
| Registered/Buffered | Unbuffered | Unbuffered | Unbuffered | Unbuffered | Unbuffered |
| XMP Support | Intel XMP 2.0 | No | Intel XMP 2.0 | No | Intel XMP 2.0 |
| RGB Lighting | No | No | No | No | No |
| Heatsink / Heatspreader | Yes | Yes | Yes | Yes | Yes |
| Intel Platform Support | Intel 12th Gen | N/A | Intel 13th Gen | N/A | Intel 10th Gen |
| AMD Platform Support | AMD Ryzen 5000 | N/A | AMD Ryzen 5000 | N/A | AMD Ryzen 5000 |
| Use Case | Gaming | General Use | Gaming / Workstation / Server | Workstation | Gaming / Workstation |
| Product Name | MEM-2951-512U2.5GB | MEM-2900-1GB= | MEM-2951-512U1.5GB Memory Module | MEM-2900-512U1GB | MEM-2951-512U4GB |
| Height | 1.2 inches | 1.2 inches | 1.4 inches | N/A | 1.2 inches |
| Width | 5.3 inches | 5.3 inches | 5.3 inches | N/A | 5.3 inches |
| Depth | 0.6 inches | 0.2 inches | 0.5 inches | N/A | 0.5 inches |
| Weight | 0.2 lbs | 0.15 lbs | 0.3 lbs | N/A | 0.3 lbs |
Reviews & Ratings
M
Marcus Fielding
4
Cisco certified kit ensured compatibility.
J
Julian Mercer
5
Better performance after upgrade.
P
Patrick Doyle
5
Reliable upgrade for branch deployments.
S
Samuel Brooks
5
Consistent results in production use.
Questions & Answers
What is the MEM-2951-512U2.5GB DRAM upgrade for Cisco 2951 ISR?
The MEM-2951-512U2.5GB is a certified DRAM upgrade kit that expands your Cisco 2951 ISR’s memory from 512 MB to 2.5 GB, ensuring higher throughput and improved performance for complex routing tasks.
Is the MEM-2951-512U2.5GB upgrade fully compatible with Cisco 2951 routers?
Yes. This DRAM kit is specifically designed, tested, and validated by Cisco for seamless compatibility with the Cisco 2951 ISR platform.
How does increasing DRAM to 2.5 GB benefit my Cisco 2951 ISR?
Upgrading to 2.5 GB DRAM allows higher concurrency, smoother VPN and firewall operations, and support for advanced features such as full MPLS and multiple service modules without memory bottlenecks.
What performance improvements can I expect after the memory upgrade?
You can expect up to 40 % faster packet processing, reduced latency on encrypted sessions, and the ability to run additional services like Cisco Application Experience on your 2951 ISR.
How do I install the MEM-2951-512U2.5GB DRAM upgrade?
Power down the router, open the chassis cover, remove the existing 512 MB module, insert the new 2 GB and 512 MB modules in the memory slots, then close the cover and power up. Follow Cisco’s hardware installation guide for step-by-step instructions.
Do I need to power off my router to install the DRAM upgrade?
Yes. Always power down and disconnect the Cisco 2951 ISR from its power source before installing or removing any memory modules to prevent hardware damage.
Will this upgrade affect my Cisco warranty or service contract?
No. Using Cisco-certified DRAM modules like MEM-2951-512U2.5GB maintains your existing Cisco warranty and service support without voiding coverage.
Which Cisco IOS versions support 2.5 GB DRAM on the 2951 ISR?
Cisco IOS 15.x and later releases for the 2951 ISR fully support 2.5 GB of DRAM. Verify compatibility by checking Cisco’s software release notes for your specific IOS version.
How do I verify the new memory after installation?
After reboot, enter the CLI command “show platform hardware qfp active feature” or “show memory summary.” You should see a total of 2560 MB (2.5 GB) of installed RAM.
Are there any prerequisites before installing the DRAM upgrade?
Ensure the router is running a supported IOS release, has a valid service contract, and is powered off. Backup your configuration as a precaution before hardware installation.
Does the memory upgrade require a BIOS or microcode update?
No BIOS or microcode update is required. The Cisco 2951 ISR automatically detects and utilizes the new DRAM modules on boot.
How does the 2.5 GB DRAM upgrade impact power consumption and heat?
The upgrade adds minimal additional power draw (under 3 W) and remains within the router’s thermal specifications. Cisco’s chassis cooling system handles the slight increase in heat.
What is the lead time and shipping policy for MEM-2951-512U2.5GB?
Typical lead time is 1–3 business days from order confirmation. We offer expedited shipping options and full tracking for on-time delivery.
What is your return and RMA policy for the memory upgrade?
We provide a 30-day satisfaction guarantee and full RMA support for defective modules. Returns are free, and replacements ship immediately upon RMA approval.
Can I install the DRAM upgrade myself or do I need a technician?
The upgrade is user-installable with basic hardware skills. Follow the provided Cisco installation guide, or contact a certified technician if you prefer professional support.
What should I do if the router does not recognize the new memory?
First, reseat the modules and verify proper slot placement. If the issue persists, update to the latest supported IOS and contact Cisco support with module serial numbers for further diagnostics.