United States$5,000,000+
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S
Stephen Lawson
5
DRAM upgrade significantly improved Cisco 2951 performance.
MEM-2951-512U4GB
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512MB to 4GB DRAM Upgrade (2 2GB DIMM) for Cisco 2951 ISR
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Name:
MEM-2951-512U4GB
- Description:
- 512MB to 4GB DRAM Upgrade (2 2GB DIMM) for Cisco 2951 ISR
- Rating:
Added to cart 28 times recently
- Availability:
In stock - Ready to Ship
- Brand:
- Cisco
- GTIN:
- 704364282781
- Condition:
- Warranty:
- 3
- List Price:
$1,200.00
- Price:
$481.0059.9% off
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1
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MEM-2951-512U4GB Overview
MEM-2951-512U4GB is a high-performance DDR4 memory module engineered in a UDIMM form factor, operating at 3200 MHz with a CAS latency of CL16 and a voltage of 1.35V. It is available as a single-channel kit featuring a 4 GB module that is non-ECC and unbuffered, making it an ideal solution for mainstream desktop and workstation builds.
MEM-2951-512U4GB comes with an integrated heatspreader for effective thermal management and is optimized for non-RGB, reliable performance in gaming and professional workstation environments. Designed with versatility in mind, it offers compatibility across desktop and laptop platforms while ensuring the stability demanded by performance-centric overclocking and general computing applications.
MEM-2951-512U4GB price is $481.00, a 59.9% saving from the Cisco list price of $1,200.00. MEM-2951-512U4GB is in stock and available for next-day dispatch. (terms applied)
Request bulk order quote for MEM-2951-512U4GB for additional pricing. Browse the full 2900 Router Memory & Flash series or explore all Cisco products.
MEM-2951-512U4GB Specifications
- Product Type
- Computer Memory
- Memory Type
- DDR4
- Capacity
- 4 GB
- Compatible Platforms
- Desktop / Laptop / Server
- Compatible Systems
- Workstation
- 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 10th Gen
- AMD Platform Support
- AMD Ryzen 5000
- Use Case
- Gaming / Workstation
- Product Name
- MEM-2951-512U4GB
- Height
- 1.2 inches
- Width
- 5.3 inches
- Depth
- 0.5 inches
- Weight
- 0.3 lbs
Quality Certifications
To get the detailed certification, please go to the Compliance Center.
Product Comparison Table 
| MEM-2951-512U4GB |  MEM-2900-512MB= |  MEM-2951-512MB= |  MEM-2951-512U1.5GB |  MEM-2900-512U2.5GB | |
|---|---|---|---|---|---|
| Product Type | Computer Memory | Computer Memory | Computer Memory | Computer Memory | Computer Memory |
| Memory Type | DDR4 | DDR4 | DDR4 | DDR4 | DDR4 |
| Capacity | 4 GB | 512 MB | 512 GB | 512 GB | 512 GB |
| Compatible Platforms | Desktop / Laptop / Server | Desktop / Server | Desktop / Laptop / Server | Desktop / Laptop / Server | Desktop / Server |
| Compatible Systems | Workstation | Tower Server / Workstation | Workstation | Workstation | Rack Server |
| Form Factor | UDIMM | UDIMM | UDIMM | UDIMM | UDIMM |
| Kit Configuration | Single Channel | Single Channel | Single Channel | Single Channel | Single Channel |
| Speed | 3200 MHz | 2933 MHz | 3200 MHz | 3200 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 | CL16 | CL16 | CL16 | CL16 |
| Voltage | 1.35V | 1.2V | 1.2V | 1.35V | 1.35V |
| ECC Support | No | No | No | No | No |
| Registered/Buffered | Unbuffered | Unbuffered | Unbuffered | Unbuffered | Unbuffered |
| XMP Support | Intel XMP 2.0 | Intel XMP 2.0 | No | Intel XMP 2.0 | No |
| RGB Lighting | No | No | No | No | No |
| Heatsink / Heatspreader | Yes | Yes | No | Yes | Yes |
| Intel Platform Support | Intel 10th Gen | Intel 13th Gen | Intel 10th Gen | Intel 13th Gen | Intel Xeon Scalable |
| AMD Platform Support | AMD Ryzen 5000 | AMD Ryzen 5000 | AMD Ryzen 3000 | AMD Ryzen 5000 | AMD EPYC |
| Use Case | Gaming / Workstation | Workstation | Workstation | Gaming / Workstation / Server | Server |
| Product Name | MEM-2951-512U4GB | MEM-2900-512MB= | MEM-2951-512MB= | MEM-2951-512U1.5GB Memory Module | MEM-2900-512U2.5GB |
| Height | 1.2 inches | 1.2 inches | 1.2 inches | 1.4 inches | 1.2 inches |
| Width | 5.3 inches | 5.3 inches | 5.3 inches | 5.3 inches | 5.3 inches |
| Depth | 0.5 inches | 0.5 inches | 0.5 inches | 0.5 inches | 0.3 inches |
| Weight | 0.3 lbs | 0.2 lbs | 0.15 lbs | 0.3 lbs | 0.5 lbs |
Reviews & Ratings
B
Brian Fletcher
5
Smooth upgrade with better multitasking.
E
Edward Simmons
5
Reliable memory kit for ISR 2951.
M
Martin Douglas
4
Noticeable stability improvement after install.
O
Oliver Kent
4
Cost effective memory upgrade.
Questions & Answers
What is the MEM-2951-512U4GB DRAM upgrade kit?
The MEM-2951-512U4GB is a Cisco-approved memory upgrade kit that replaces your existing 512 MB with two 2 GB DIMM modules, delivering a total of 4 GB DRAM for the Cisco 2951 ISR router.
Is the MEM-2951-512U4GB compatible with Cisco 2951 ISR routers?
Yes. This upgrade kit is specifically tested and certified for seamless compatibility with Cisco 2951 ISR platforms running approved IOS firmware.
What components are included in the MEM-2951-512U4GB package?
The package contains two 2 GB DDR3 ECC SODIMM modules, installation instructions, and an antistatic bag to ensure safe handling and installation.
How much memory will my Cisco 2951 ISR have after installation?
After installing the two 2 GB DIMMs, your Cisco 2951 ISR will have a total of 4 GB DRAM, up from the factory 512 MB.
What type and speed of memory does the MEM-2951-512U4GB use?
It uses industry-standard DDR3 ECC SODIMM modules running at 1333 MHz (PC3-10600) to ensure stability and error correction.
Does the MEM-2951-512U4GB support ECC (Error-Correcting Code)?
Yes. The upgrade kit supports full ECC functionality to detect and correct single-bit memory errors for maximum data integrity.
What performance benefits does upgrading to 4 GB DRAM provide?
Upgrading to 4 GB DRAM increases packet throughput, supports more concurrent VPN sessions, and enhances feature sets like Cisco Application Visibility and Control.
Do I need to upgrade the router IOS to use 4 GB DRAM?
No. Most IOS versions compatible with the Cisco 2951 ISR already support up to 4 GB of DRAM. Verify your IOS release notes for any specific memory requirements.
How is the MEM-2951-512U4GB installed?
Power down your router, open the DIMM cover, replace the existing 512 MB modules with the two 2 GB modules, reassemble, and power up. Follow the included antistatic and installation guide.
Will I experience downtime during the installation?
Yes. A brief power-off period is required. Plan for a short maintenance window to prevent service interruptions.
Is technical support available for installation?
Yes. We provide phone and online technical support to guide you through installation and post-upgrade validation at no additional charge.
What warranty covers the MEM-2951-512U4GB upgrade kit?
The memory upgrade kit includes a one-year limited warranty against defects in materials and workmanship.
Can I return the MEM-2951-512U4GB if it doesn’t meet my needs?
Yes. We offer a 30-day return policy from the date of delivery. The product must be in original condition and packaging.
How do I verify the new memory after installation?
After reboot, enter the router CLI and use the "show memory" or "show platform hardware capacity" commands to confirm the system recognizes 4 GB DRAM.
Where can I purchase the MEM-2951-512U4GB upgrade kit?
You can order directly from our online store or contact an authorized Cisco reseller to ensure genuine parts and full support.