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Memory upgrade improved application handling.
MEM-2951-512U1.5GB
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UPG 1.5GB FROM 512MB DRAM 1GB+512MB FOR 2951 ISR
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Name:
MEM-2951-512U1.5GB
- Description:
- UPG 1.5GB FROM 512MB DRAM 1GB+512MB FOR 2951 ISR
- Rating:
Added to cart 28 times recently
- Availability:
In stock - Ready to Ship
- Brand:
- Cisco
- GTIN:
- 80479907246
- Condition:
- Warranty:
- 3
- List Price:
$700.00
- Price:
$287.0059% off
Quantity:
1
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MEM-2951-512U1.5GB Overview
MEM-2951-512U1.5GB is a high-performance DDR4 memory module designed in a full-size UDIMM form factor for desktop, laptop, and server applications. It features a speed of 3200 MHz with a CAS latency of CL16 and operates at 1.35V, ensuring efficient responsiveness and stability in demanding environments.
Engineered as a single-channel non-ECC and unbuffered kit, this module comes equipped with a robust heatspreader for improved thermal performance without RGB lighting support. Ideal for gaming, workstation, and server builds, MEM-2951-512U1.5GB delivers reliable performance across a broad range of compatible Intel 13th Gen and AMD Ryzen 5000 platforms.
MEM-2951-512U1.5GB price is $287.00, a 59% saving from the Cisco list price of $700.00. MEM-2951-512U1.5GB is in stock and available for next-day dispatch. (terms applied)
Request bulk order quote for MEM-2951-512U1.5GB for additional pricing. Browse the full 2900 Router Memory & Flash series or explore all Cisco products.
MEM-2951-512U1.5GB Specifications
- Height
- 1.4 inches
- Width
- 5.3 inches
- Weight
- 0.3 lbs
- Depth
- 0.5 inches
- Operating Temperature
- N/A
- Product Type
- Computer Memory
- Memory Type
- DDR4
- Compatible Platforms
- Desktop / Laptop / Server
- Compatible Systems
- Workstation
- Form Factor
- UDIMM
- Speed
- 3200 MHz
- 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
- AMD Platform Support
- AMD Ryzen 5000
- Kit Configuration
- Single Channel
- Use Case
- Gaming / Workstation / Server
- Capacity
- 512 GB
- Intel Platform Support
- Intel 13th Gen
- Product Name
- MEM-2951-512U1.5GB Memory Module
MEM-2951-512U1.5GB Use Case
High-Performance DMVPN Hub with MEM-2951-512U1.5GB-UPG on Cisco 2951 ISR
In a mid-sized enterprise deploying a dynamic multipoint VPN (DMVPN) hub for 100+ branch locations, upgrading the Cisco 2951 ISR from 512 MB to 1.5 GB DRAM with MEM-2951-512U1.5GB-UPG eliminates memory bottlenecks under heavy IPsec workloads. The extra RAM ensures consistent tunnel throughput, seamless route convergence and low latency, delivering secure, always-on connectivity and simplified network management.
Unified Communications Edge Gateway Powered by MEM-2951-512U1.5GB-UPG
A healthcare provider running Cisco Unified Communications Manager Express on a 2951 ISR requires robust voice and video call processing for 50+ concurrent sessions. By installing the MEM-2951-512U1.5GB-UPG module, the router can host advanced call-control features, deliver end-to-end QoS and handle encryption tasks without drops, resulting in crystal-clear telehealth calls, regulatory compliance and improved patient experience.
Embedded Virtual Network Functions (VNFs) on 2951 ISR with 1.5 GB DRAM Upgrade
A managed service provider consolidates firewall, WAN optimization and IoT gateway services on a single Cisco 2951 ISR using IOS-XE service containers. The MEM-2951-512U1.5GB-UPG upgrade provides enough memory to host multiple VNFs simultaneously, reducing hardware sprawl, accelerating time-to-service and lowering total cost of ownership while maintaining carrier-grade performance.
Quality Certifications
To get the detailed certification, please go to the Compliance Center.
Product Comparison Table 
| MEM-2951-512U1.5GB |  MEM-2951-512U1GB |  MEM-2951-512U2GB |  MEM-2951-512MB= |  MEM-2900-512U1.5GB | |
|---|---|---|---|---|---|
| Product Type | Computer Memory | Computer Memory | Computer Memory | Computer Memory | Computer Memory |
| Memory Type | DDR4 | DDR4 | DDR4 | DDR4 | DDR3 |
| Capacity | 512 GB | 512 GB | 512 GB | 512 GB | 1.5GB |
| Compatible Platforms | Desktop / Laptop / Server | Desktop / Laptop / Server | Desktop | Desktop / Laptop / Server | Desktop |
| Compatible Systems | Workstation | Rack Server / Tower Server / Blade Server / Workstation / N/A | Workstation | Workstation | N/A |
| Form Factor | UDIMM | UDIMM | UDIMM | UDIMM | UDIMM |
| Kit Configuration | Single Channel | Single Channel | Dual Channel | Single Channel | Single Channel |
| Speed | 3200 MHz | 3200 MHz | 3200 MHz | 3200 MHz | 1600 MHz |
| Operating Temperature | N/A | N/A | N/A | N/A | 0°C to 85°C |
| Reliability Rating | Standard | Standard | Standard | Standard | Standard |
| CAS Latency (CL) | CL16 | CL16 | CL16 | CL16 | CL11 |
| Voltage | 1.35V | 1.35V | 1.35V | 1.2V | 1.5V |
| 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 | No |
| RGB Lighting | No | No | No | No | No |
| Heatsink / Heatspreader | Yes | Yes | Yes | No | Yes |
| Intel Platform Support | Intel 13th Gen | Intel 13th Gen | Intel 12th Gen | Intel 10th Gen | N/A |
| AMD Platform Support | AMD Ryzen 5000 | AMD Ryzen 5000 | AMD Ryzen 5000 | AMD Ryzen 3000 | N/A |
| Use Case | Gaming / Workstation / Server | Server | Gaming | Workstation | General Use |
| Product Name | MEM-2951-512U1.5GB Memory Module | MEM-2951-512U1GB | MEM-2951-512U2GB | MEM-2951-512MB= | MEM-2900-512U1.5GB |
| Height | 1.4 inches | 1.18 inches | 1.2 inches | 1.2 inches | 1.5 inches |
| Width | 5.3 inches | 5.25 inches | 5.0 inches | 5.3 inches | 5.3 inches |
| Depth | 0.5 inches | 0.36 inches | 0.5 inches | 0.5 inches | 0.5 inches |
| Weight | 0.3 lbs | 0.3 lbs | 0.3 lbs | 0.15 lbs | 0.45 lbs |
Reviews & Ratings
V
Victor Lang
5
Cisco memory worked exactly as specified.
W
William Harper
4
Stable performance after deployment.
X
Xavier Nolan
4
Good capacity increase for ISR 2951.
Z
Zachary Cole
5
No issues since installation.
Questions & Answers
What is the MEM-2951-512U1.5GB memory upgrade kit?
The MEM-2951-512U1.5GB is a Cisco-certified DRAM upgrade module that expands a Cisco 2951 ISR’s memory from 512 MB to 1.5 GB, enabling advanced routing and security features.
Which routers are compatible with MEM-2951-512U1.5GB?
This memory upgrade is compatible exclusively with the Cisco ISR 2951 series running Cisco IOS, ensuring full hardware and software interoperability.
Why upgrade your Cisco 2951 ISR from 512 MB to 1.5 GB DRAM?
Upgrading to 1.5 GB DRAM reduces memory bottlenecks, allowing simultaneous VPN, voice, and WAN optimization services for improved network performance.
What performance improvements will I see after upgrading memory?
After upgrading, you’ll experience faster boot times, enhanced routing throughput, and the ability to enable memory-intensive features like advanced security and data caching.
What components are included in the MEM-2951-512U1.5GB kit?
The kit includes one 1 GB DRAM module, one 512 MB DRAM module, mounting screws, and a step-by-step installation guide.
How do I safely install the upgraded memory on my Cisco 2951 router?
Power off and unplug the router, remove the chassis cover, replace the existing modules with the new DRAM modules, reattach the cover, and power on the router following the included instructions.
Do I need to back up my configuration before installing the memory upgrade?
Yes. Always back up your current router configuration to prevent data loss and ensure quick recovery if issues arise.
Will installing MEM-2951-512U1.5GB cause downtime?
Yes. Installation requires powering down the router, resulting in downtime typically under 10 minutes.
Are there any software configurations required post-installation?
No. The router automatically detects the additional memory on reboot without any manual configuration changes.
How can I verify the memory upgrade is successful?
Use the Cisco IOS CLI command show memory summary or show version to confirm the total physical memory reads 1536 MB.
Is the MEM-2951-512U1.5GB module covered by warranty?
Yes. The module includes a limited lifetime warranty provided through Cisco’s authorized reseller network.
Does the memory upgrade support Cisco IOS features like WAN acceleration?
Yes. The additional DRAM enables memory-intensive features, including WAN acceleration, advanced security, and data caching.
How much power does the additional memory consume?
The additional 1 GB DRAM consumes approximately 2 W, maintaining efficient power usage.
Can I return or exchange the memory upgrade if it’s incompatible?
Yes. We offer a 30-day return and exchange policy for any defective or incompatible upgrade modules.
Where can I purchase the MEM-2951-512U1.5GB upgrade kit?
You can purchase the MEM-2951-512U1.5GB kit directly from our official Cisco reseller portal or through authorized distributors.
Is technical support available for installation assistance?
Yes. Our 24/7 technical support team is available via phone or chat to assist with installation and troubleshooting.
What troubleshooting steps should I follow if the router does not recognize the new memory?
Ensure the DRAM modules are properly seated, verify compatibility, update to the latest Cisco IOS version, and recheck with show memory; contact support if issues persist.