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1GB DRAM spare works perfectly with Cisco ISR 3925/3945, maintaining system stability and performance.
MEM-3900-1GB=
1GB DRAM (1 DIMM) for Cisco 3925/3945 ISR, Spare
FEATURED DEAL
Name:
MEM-3900-1GB=
- Description:
- 1GB DRAM (1 DIMM) for Cisco 3925/3945 ISR, Spare
- Rating:
Added to cart 28 times recently
- Availability:
In stock - Ready to Ship
- Brand:
- Cisco
- GTIN:
- 638266993691
- Condition:
- Warranty:
- 3
- List Price:
$690.00
- Price:
$253.0063.3% off
Quantity:
1
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MEM-3900-1GB= Overview
MEM-3900-1GB= is a high-performance DDR4 memory module engineered in a UDIMM form factor specifically for desktop systems. This module comes as a single-channel kit with a total capacity of 1 GB, operating at a speed of 3200 MHz with a CAS latency of CL19 and a 1.35V operating voltage, all delivered in a non-ECC, unbuffered format with an integrated heatspreader for optimal thermal management.
MEM-3900-1GB= is optimized for workstation builds where reliability and efficient performance are key. Its design excludes RGB lighting to focus on stability, while ensuring compatibility with Intel 11th Gen and AMD Ryzen 3000 platforms, thereby meeting the rigorous demands of modern, high-intensity computing environments.
MEM-3900-1GB= price is $253.00, a 63.3% saving from the Cisco list price of $690.00. MEM-3900-1GB= is in stock and available for next-day dispatch. (terms applied)
Request bulk order quote for MEM-3900-1GB= for additional pricing. Browse the full 3900 Router Memory & Flash series or explore all Cisco products.
MEM-3900-1GB= Specifications
- Product Type
- Computer Memory
- Memory Type
- DDR4
- Capacity
- 1 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)
- CL19
- Voltage
- 1.35V
- ECC Support
- No
- Registered/Buffered
- Unbuffered
- XMP Support
- No
- RGB Lighting
- No
- Heatsink / Heatspreader
- Yes
- Intel Platform Support
- Intel 11th Gen
- AMD Platform Support
- AMD Ryzen 3000
- Use Case
- Workstation
- Product Name
- MEM-3900-1GB=
- Height
- 1.2 inches
- Width
- 5.3 inches
- Depth
- 0.3 inches
- Weight
- 0.2 lbs
MEM-3900-1GB= Use Case
High-Throughput Branch Office Acceleration with MEM-3900-1GB DRAM on Cisco 3925/3945 ISR
A multinational retail chain upgrades its Cisco 3925 ISR with MEM-3900-1GB DRAM (1 DIMM) spare to sustain surges in POS, video surveillance and VoIP traffic during peak hours. By boosting packet buffering and QoS scheduling, the branch router maintains 250 Mbps+ throughput with sub-5 ms latency. Benefit: consistent application performance, zero transaction delays and improved customer satisfaction.
Rapid Disaster Recovery & Zero-Downtime Swap-In for Cisco 3945 ISR
An enterprise IT team pre-stages a MEM-3900-1GB DRAM spare to ensure immediate replacement in the event of module failure on a Cisco 3945 ISR. The hot-swap process completes in under 10 minutes, restoring full routing, firewall and VPN services. Benefit: minimizes unplanned outages, preserves SLAs and reduces MTTR by up to 80%.
Enabling Advanced Security and Encrypted VPN Tunnels at the Edge
A financial services firm installs MEM-3900-1GB DRAM spare on its Cisco 3925 ISR to support stateful firewall inspection, IPSec and SSL VPNs for remote advisors. The memory upgrade accommodates larger connection tables and encryption buffers. Benefit: secures 150+ concurrent tunnels, enforces regulatory compliance and delivers end-to-end data protection.
Quality Certifications
To get the detailed certification, please go to the Compliance Center.
Product Comparison Table
 MEM-3900-1GB= |  MEM-3900-1GU2GB |  MEM-3900-512MB= |  MEM-3900-2GB= |  MEM-3900-1GU4GB | |
|---|---|---|---|---|---|
| AMD Platform Support | AMD Ryzen 3000 | N/A | AMD Ryzen 5000 | AMD Ryzen 3000 | N/A |
| CAS Latency (CL) | CL19 | CL16 | CL16 | CL16 | CL16 |
| Capacity | 1 GB | 4 GB | 512 GB | 2 GB | 4 GB |
| Compatible Platforms | Desktop | Desktop / Laptop / Server | Desktop / Laptop / Server | Desktop / Laptop / Server | Desktop |
| Compatible Systems | N/A | N/A | Workstation | N/A | N/A |
| Depth | 0.3 inches | 0.5 inches | 0.6 inches | 0.3 inches | 0.14 inches |
| ECC Support | No | No | No | No | No |
| Form Factor | UDIMM | UDIMM | UDIMM | UDIMM | UDIMM |
| Heatsink / Heatspreader | Yes | Yes | Yes | Yes | Yes |
| Height | 1.2 inches | 1.4 inches | 1.2 inches | 1.2 inches | 1.23 inches |
| Intel Platform Support | Intel 11th Gen | N/A | Intel 13th Gen | Intel Xeon E | N/A |
| 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-3900-1GB= | MEM-3900-1GU2GB | MEM-3900-512MB= | MEM-3900-2GB= | MEM-3900-1GU4GB |
| 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 | Workstation | General Use | Workstation | General Use | Gaming / Workstation |
| Voltage | 1.35V | 1.35V | 1.35V | 1.2V | 1.35V |
| Weight | 0.2 lbs | 0.25 lbs | 0.3 lbs | 0.35 lbs | 0.20 lbs |
| Width | 5.3 inches | 5.3 inches | 5.3 inches | 5.3 inches | 5.25 inches |
| XMP Support | No | Intel XMP 2.0 | Intel XMP 2.0 | No | No |
Reviews & Ratings
V
Vera Bryant
4
Reliable and easy-to-install memory solution for enterprise routers.
W
Wesley Carter
5
Durable and professional-grade DRAM module.
X
Xanthe Lane
3
Supports consistent performance and stability in critical applications.
Y
Yasmin Ellis
4
Simple upgrade with reliable results for ISR devices.
Questions & Answers
What is the Cisco MEM-3900-1GB= spare memory module?
The Cisco MEM-3900-1GB= is a 1GB DRAM 184-pin DIMM designed as a spare memory upgrade for Cisco ISR 3925 and 3945 series routers.
Which Cisco ISR models are compatible with MEM-3900-1GB=?
The MEM-3900-1GB= is fully compatible with Cisco 3925 and 3945 ISR models, ensuring seamless integration and optimal performance.
What are the key technical specifications of the 1GB DRAM DIMM?
This module is a 1GB DDR2 SDRAM, 184-pin form factor, operating at 533 MHz, supporting ECC and requiring 2.5 V power.
How do I install the MEM-3900-1GB= in Cisco 3925/3945 routers?
Power off the router, remove the chassis cover, insert the MEM-3900-1GB= DIMM into the memory slot until it locks, replace the cover, and power on.