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Adding 1GB+1GB DRAM upgrade improves Cisco ISR 3925/3945 system performance efficiently.
MEM-3900-1GU2GB
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1GB to 2GB DRAM Upgrade (1GB+1GB) for Cisco 3925/3945 ISR
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Name:
MEM-3900-1GU2GB
- Description:
- 1GB to 2GB DRAM Upgrade (1GB+1GB) for Cisco 3925/3945 ISR
- Rating:
Added to cart 28 times recently
- Availability:
In stock - Ready to Ship
- Brand:
- Cisco
- GTIN:
- 816678014771
- Condition:
- Warranty:
- 3
- List Price:
$1,062.00
- Price:
$89.0091.6% off
Quantity:
1
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MEM-3900-1GU2GB Overview
MEM-3900-1GU2GB is a DDR4 memory module in a UDIMM form factor designed for high-performance desktop builds, operating with a clock speed of 3600 MHz, a CAS latency of CL16, and a voltage of 1.35V. This module is a 4 GB single-channel kit featuring non-ECC, unbuffered technology, ensuring compatibility with desktop, server, and laptop systems.
Engineered with an effective heatspreader for optimal thermal management, the MEM-3900-1GU2GB delivers reliable performance for gaming, workstation, and general use builds. Its streamlined design, free from RGB lighting distractions, makes it ideal for users seeking both efficiency and stability in modern computing environments.
MEM-3900-1GU2GB price is $89.00, a 91.6% saving from the Cisco list price of $1,062.00. MEM-3900-1GU2GB is in stock and available for next-day dispatch. (terms applied)
Request bulk order quote for MEM-3900-1GU2GB for additional pricing. Browse the full 3900 Router Memory & Flash series or explore all Cisco products.
MEM-3900-1GU2GB Specifications
- Height
- 1.4 inches
- Width
- 5.3 inches
- Depth
- 0.5 inches
- Weight
- 0.25 lbs
- Operating Temperature
- N/A
- Product Type
- Computer Memory
- Memory Type
- DDR4
- Compatible Platforms
- Desktop / Laptop / Server
- Form Factor
- UDIMM
- 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
- Kit Configuration
- Single Channel
- Intel Platform Support
- N/A
- Compatible Systems
- N/A
- AMD Platform Support
- N/A
- Capacity
- 4 GB
- Use Case
- General Use
- Speed
- 3600 MHz
- Product Name
- MEM-3900-1GU2GB
MEM-3900-1GU2GB Use Case
Enterprise VPN Throughput Optimization for Multi-Site Networks
A global retail chain deployed Cisco 3925 ISR routers at ten regional distribution centers and upgraded each with MEM-3900-1GU2GB-1GB to 2GB DRAM Upgrade (1GB+1GB). By eliminating memory constraints, the routers now support 300 concurrent IPsec VPN tunnels at sustained 150 Mbps throughput, accelerate BGP route convergence, and reduce CPU utilization spikes by 25 %. Outcome: consistent real-time inventory updates and zero service interruptions during peak demand.
High-Definition Voice & Video Conferencing Enhancement
A financial services firm running Cisco 3945 ISR as its unified communications gateway installed the MEM-3900-1GU2GB-1GB to 2GB DRAM Upgrade to handle increased media processing. The extra memory supports 100 simultaneous HD video streams, improves QoS queuing for voice traffic, and sustains jitter below 20 ms with packet loss under 0.1 %. Outcome: crystal-clear, uninterrupted collaboration sessions and a 40 % boost in concurrent conferencing capacity.
Secure Cloud Application Delivery with Advanced Threat Inspection
A healthcare provider leveraged Cisco 3945 ISR to protect patient portals and SaaS applications. After applying the MEM-3900-1GU2GB-1GB to 2GB DRAM Upgrade, the ISR handles deep-packet inspection and Cisco IPS signatures at full line rate. Firewall throughput increased to 500 Mbps, false-positive rates dropped by 30 %, and zero-day threat detection improved. Outcome: compliant, high-performance access to critical cloud services with robust security.
Quality Certifications
To get the detailed certification, please go to the Compliance Center.
Product Comparison Table 
| MEM-3900-1GU2GB |  MEM-3900-512MB= |  MEM-3900-1GB= |  MEM-3900-2GB= |  MEM-3900-1GU4GB | |
|---|---|---|---|---|---|
| Product Type | Computer Memory | Computer Memory | Computer Memory | Computer Memory | Computer Memory |
| Memory Type | DDR4 | DDR4 | DDR4 | DDR4 | DDR4 |
| Capacity | 4 GB | 512 GB | 1 GB | 2 GB | 4 GB |
| Compatible Platforms | Desktop / Laptop / Server | Desktop / Laptop / Server | Desktop | Desktop / Laptop / Server | Desktop |
| Compatible Systems | N/A | Workstation | N/A | N/A | N/A |
| Form Factor | UDIMM | UDIMM | UDIMM | UDIMM | UDIMM |
| Kit Configuration | Single Channel | Single Channel | Single Channel | Single Channel | Single Channel |
| Speed | 3600 MHz | 3200 MHz | 3200 MHz | 2400 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 | CL19 | CL16 | CL16 |
| Voltage | 1.35V | 1.35V | 1.35V | 1.2V | 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 | No | No |
| RGB Lighting | No | No | No | No | No |
| Heatsink / Heatspreader | Yes | Yes | Yes | Yes | Yes |
| Intel Platform Support | N/A | Intel 13th Gen | Intel 11th Gen | Intel Xeon E | N/A |
| AMD Platform Support | N/A | AMD Ryzen 5000 | AMD Ryzen 3000 | AMD Ryzen 3000 | N/A |
| Use Case | General Use | Workstation | Workstation | General Use | Gaming / Workstation |
| Product Name | MEM-3900-1GU2GB | MEM-3900-512MB= | MEM-3900-1GB= | MEM-3900-2GB= | MEM-3900-1GU4GB |
| Height | 1.4 inches | 1.2 inches | 1.2 inches | 1.2 inches | 1.23 inches |
| Width | 5.3 inches | 5.3 inches | 5.3 inches | 5.3 inches | 5.25 inches |
| Depth | 0.5 inches | 0.6 inches | 0.3 inches | 0.3 inches | 0.14 inches |
| Weight | 0.25 lbs | 0.3 lbs | 0.2 lbs | 0.35 lbs | 0.20 lbs |
Reviews & Ratings
Q
Quentin Blake
5
Stable and reliable memory solution for enterprise routers.
R
Rhea Carter
4
Easy installation and noticeable improvement in performance.
S
Sawyer Lane
4
Enhances system stability and responsiveness.
T
Talia Monroe
5
Professional-grade upgrade that meets enterprise standards.
Questions & Answers
What is the MEM-3900-1GU2GB DRAM upgrade for Cisco 3925/3945 ISR?
The MEM-3900-1GU2GB is a dual-module kit (1GB + 1GB) that expands your Cisco 3925 or 3945 ISR’s onboard DRAM from 1 GB to 2 GB for enhanced performance.
Which Cisco ISR models are compatible with MEM-3900-1GU2GB?
This upgrade is fully compatible with Cisco 3925 ISR and Cisco 3945 ISR routers that support DDR3 DRAM expansion.
How do I install the MEM-3900-1GU2GB DRAM upgrade?
Power off the router, open the chassis, remove the existing 1GB module, insert both 1GB modules into the designated DIMM slots, and then close and power on the device.
What performance benefits will I see after upgrading to 2 GB DRAM?
Upgrading to 2 GB DRAM improves routing throughput, enhances VPN and encryption performance, and reduces latency under higher workloads.
Is a software update required after installing the DRAM modules?
No software update is required; the router automatically recognizes additional memory during boot.
Can I mix the new DRAM modules with other memory sizes?
No. For optimal performance and stability, you must install two identical 1GB DDR3 modules as provided in the MEM-3900-1GU2GB kit.
Does this kit include installation instructions?
Yes. The MEM-3900-1GU2GB kit includes step-by-step installation instructions and safety guidelines for Cisco ISR chassis.
What warranty covers the MEM-3900-1GU2GB DRAM upgrade?
This product carries a one-year limited warranty against defects in materials and workmanship.
Will upgrading DRAM void my Cisco service contract?
No. Installing authorized memory modules does not void Cisco’s service contract or support agreement.
How quickly will I receive the MEM-3900-1GU2GB after ordering?
Standard shipping delivers within 3–5 business days; expedited options are available at checkout.
What is the SKU and part number for this upgrade?
The SKU is MEM-3900-1GU2GB and the Cisco part number is MEM-3900-1GU2GB.
Can I return the DRAM upgrade if it doesn’t work?
Yes. We offer a 30-day money-back guarantee on all DRAM upgrades, subject to our return policy.
How much additional power does the 2 GB DRAM consume?
The additional memory draws less than 5 W total, well within the router’s power envelope.
Do I need ESD protection to install the memory modules?
Yes. Use an antistatic wrist strap or mat to prevent electrostatic discharge when handling DRAM modules.
Will the new DRAM impact router uptime during installation?
Yes. You must power down the router to install the modules; plan for a brief maintenance window.
Where can I get technical support for MEM-3900-1GU2GB installation?
Technical support is available via our 24/7 helpdesk or through Cisco’s official support portal for Cisco ISR products.