United States$5,000,000+
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K
Kieran Shaw
5
Upgrading to 4GB DRAM on Cisco 3925/3945 improved performance and application responsiveness significantly.
MEM-3900-1GU4GB
UPG 4GB FROM 1GB DRAM 2GB+2GB FOR 3925/3945 ISR
FEATURED DEAL
Name:
MEM-3900-1GU4GB
- Description:
- UPG 4GB FROM 1GB DRAM 2GB+2GB FOR 3925/3945 ISR
- Rating:
Added to cart 28 times recently
- Availability:
In stock - Ready to Ship
- Brand:
- Cisco
- GTIN:
- 12306905293
- Condition:
- Warranty:
- 3
- List Price:
$1,204.00
- Price:
$481.0060% off
Quantity:
1
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MEM-3900-1GU4GB Overview
MEM-3900-1GU4GB is a high-performance DDR4 memory module engineered for desktop systems, offering a reliable and efficient solution for modern computing needs. It boasts a DIMM form factor with a speed of 3200 MHz, a CAS latency of CL16, and operates at a voltage of 1.35V, ensuring optimal performance for everyday computing tasks.
Designed with a 4 GB capacity in a single-channel kit configuration, MEM-3900-1GU4GB is non-ECC and unbuffered, making it perfectly suited for gaming and workstation builds. The module features an integrated heatspreader for better thermal management and does not incorporate RGB lighting, aligning with its focus on streamlined, high-quality performance.
MEM-3900-1GU4GB price is $481.00, a 60% saving from the Cisco list price of $1,204.00. MEM-3900-1GU4GB is in stock and available for next-day dispatch. (terms applied)
Request bulk order quote for MEM-3900-1GU4GB for additional pricing. Browse the full 3900 Router Memory & Flash series or explore all Cisco products.
MEM-3900-1GU4GB Specifications
- Product Type
- Computer Memory
- Memory Type
- DDR4
- Capacity
- 4 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
- No
- RGB Lighting
- No
- Heatsink / Heatspreader
- Yes
- Intel Platform Support
- N/A
- AMD Platform Support
- N/A
- Use Case
- Gaming / Workstation
- Product Name
- MEM-3900-1GU4GB
- Height
- 1.23 inches
- Width
- 5.25 inches
- Depth
- 0.14 inches
- Weight
- 0.20 lbs
MEM-3900-1GU4GB Use Case
Accelerating Site-to-Site IPsec VPNs for Global Branch Networks
MEM-3900-1GU4GB-UPG DRAM upgrade powers Cisco ISR 3925/3945 routers at 150+ retail branches, boosting onboard memory from 1 GB to 4 GB. This upgrade supports 200 concurrent IPsec site-to-site VPN tunnels with AES-256 encryption and scalable route caching. Outcome: Sustains 200 Mbps encrypted throughput per branch, reduces latency by 30%, and ensures PCI DSS compliance.
Enhancing SD-WAN Edge Performance for Cloud Applications
MEM-3900-1GU4GB-UPG DRAM upgrade optimizes SD-WAN edge connectivity on Cisco ISR 3925/3945 routers for a professional services firm. The added 4 GB DRAM enables advanced dynamic path selection, real-time vAnalytics telemetry, and local internet breakout for Office 365 and Salesforce traffic. Outcome: Improves application response times by 40%, cuts WAN costs by 25%, and enforces SLA-driven QoS.
Enabling NFV and Multi-Service Virtualization at the Enterprise Edge
MEM-3900-1GU4GB-UPG DRAM upgrade unlocks NFV capabilities on Cisco ISR 3925/3945 edge platforms for a managed services provider. Expanding DRAM to 4 GB allows concurrent VNFs—firewall, WAN optimization, VoIP—on a single chassis while maintaining high throughput and low jitter. Outcome: Consolidates three standalone devices into one, reduces CapEx by 20%, and accelerates new service provisioning by 50%.
Quality Certifications
To get the detailed certification, please go to the Compliance Center.
Product Comparison Table
 MEM-3900-1GU4GB |  MEM-3900-1GU2GB |  MEM-3900-1GB= |  MEM-3900-2GB= |  MEM-3900-512MB= | |
|---|---|---|---|---|---|
| AMD Platform Support | N/A | N/A | AMD Ryzen 3000 | AMD Ryzen 3000 | AMD Ryzen 5000 |
| CAS Latency (CL) | CL16 | CL16 | CL19 | CL16 | CL16 |
| Capacity | 4 GB | 4 GB | 1 GB | 2 GB | 512 GB |
| Compatible Platforms | Desktop | Desktop / Laptop / Server | Desktop | Desktop / Laptop / Server | Desktop / Laptop / Server |
| Compatible Systems | N/A | N/A | N/A | N/A | Workstation |
| Depth | 0.14 inches | 0.5 inches | 0.3 inches | 0.3 inches | 0.6 inches |
| ECC Support | No | No | No | No | No |
| Form Factor | UDIMM | UDIMM | UDIMM | UDIMM | UDIMM |
| Heatsink / Heatspreader | Yes | Yes | Yes | Yes | Yes |
| Height | 1.23 inches | 1.4 inches | 1.2 inches | 1.2 inches | 1.2 inches |
| Intel Platform Support | N/A | N/A | Intel 11th Gen | Intel Xeon E | Intel 13th Gen |
| Kit Configuration | Single Channel | Single Channel | Single Channel | Single Channel | Single Channel |
| Memory Type | DDR4 | DDR4 | DDR4 | DDR4 | DDR4 |
| Operating Temperature | N/A | N/A | N/A | N/A | N/A |
| Product Name | MEM-3900-1GU4GB | MEM-3900-1GU2GB | MEM-3900-1GB= | MEM-3900-2GB= | MEM-3900-512MB= |
| Product Type | Computer Memory | Computer Memory | Computer Memory | Computer Memory | Computer Memory |
| RGB Lighting | No | No | No | No | No |
| Registered/Buffered | Unbuffered | Unbuffered | Unbuffered | Unbuffered | Unbuffered |
| Reliability Rating | Standard | Standard | Standard | Standard | Standard |
| Speed | 3200 MHz | 3600 MHz | 3200 MHz | 2400 MHz | 3200 MHz |
| Use Case | Gaming / Workstation | General Use | Workstation | General Use | Workstation |
| Voltage | 1.35V | 1.35V | 1.35V | 1.2V | 1.35V |
| Weight | 0.20 lbs | 0.25 lbs | 0.2 lbs | 0.35 lbs | 0.3 lbs |
| Width | 5.25 inches | 5.3 inches | 5.3 inches | 5.3 inches | 5.3 inches |
| XMP Support | No | Intel XMP 2.0 | No | No | Intel XMP 2.0 |
Reviews & Ratings
L
Lydia Fraser
4
Reliable memory upgrade that enhances system stability.
M
Marcus Price
5
Simple to install and works flawlessly with ISR devices.
N
Nina Ellis
3
High-quality Cisco memory with consistent, dependable operation.
O
Owen Tate
4
Boosts throughput and overall performance for demanding network tasks.
Questions & Answers
What is MEM-3900-1GU4GB?
MEM-3900-1GU4GB is a Cisco-certified 4 GB DRAM upgrade kit (2×2 GB) designed specifically for Cisco ISR 3925 and 3945 routers.
Is MEM-3900-1GU4GB compatible with Cisco ISR 3925 and 3945?
Yes. MEM-3900-1GU4GB is engineered and tested for full compatibility with Cisco ISR 3925 and 3945 platforms to ensure reliable operation.
How do I install MEM-3900-1GU4GB in my Cisco ISR router?
Power off the router, remove the chassis cover, align and insert the two 2 GB memory modules into the designated DRAM slots, replace the cover, and power on the device.
Do I need to schedule downtime for the memory upgrade?
Yes. Because the installation requires a power cycle, schedule a maintenance window to minimize network impact.