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MEM-3900-1GU2GB
1GB to 2GB DRAM Upgrade (1GB+1GB) for Cisco 3925/3945 ISR
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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.
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.
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.
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.
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| 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 |
| 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 |
| 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 |
| 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 |
Every unit is authentic, sourced through trusted and authorised channels, and serial-verified on request. Genuine networking and IT hardware, guaranteed, or your money back.
New products are backed by up to 3 years of extended warranty, and certified refurbished units by up to 3 months, for dependable protection on every order. Coverage is clear, honoured in full, and confirmed on each product page.
If a unit ever falls short, our streamlined RMA process gets a replacement to you fast, with advance replacement available to keep your network running. No jargon, no runaround.
Every device is inspected, bench-tested, and firmware-verified, with configurations wiped before dispatch. Additional testing can be arranged to confirm full working condition on request.
Our specialists assist with compatibility, configuration, licensing, and installation, before and after you buy. Real hardware expertise, whenever you need it.
dispatched quickly and shipped worldwide from regional hubs, fully tracked and insured.
Adding 1GB+1GB DRAM upgrade improves Cisco ISR 3925/3945 system performance efficiently.
Stable and reliable memory solution for enterprise routers.
Easy installation and noticeable improvement in performance.
Enhances system stability and responsiveness.
Professional-grade upgrade that meets enterprise standards.
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.
This upgrade is fully compatible with Cisco 3925 ISR and Cisco 3945 ISR routers that support DDR3 DRAM expansion.
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.
Upgrading to 2 GB DRAM improves routing throughput, enhances VPN and encryption performance, and reduces latency under higher workloads.
No software update is required; the router automatically recognizes additional memory during boot.
No. For optimal performance and stability, you must install two identical 1GB DDR3 modules as provided in the MEM-3900-1GU2GB kit.
Yes. The MEM-3900-1GU2GB kit includes step-by-step installation instructions and safety guidelines for Cisco ISR chassis.
This product carries a one-year limited warranty against defects in materials and workmanship.
No. Installing authorized memory modules does not void Cisco’s service contract or support agreement.
Standard shipping delivers within 3–5 business days; expedited options are available at checkout.
The SKU is MEM-3900-1GU2GB and the Cisco part number is MEM-3900-1GU2GB.
Yes. We offer a 30-day money-back guarantee on all DRAM upgrades, subject to our return policy.
The additional memory draws less than 5 W total, well within the router’s power envelope.
Yes. Use an antistatic wrist strap or mat to prevent electrostatic discharge when handling DRAM modules.
Yes. You must power down the router to install the modules; plan for a brief maintenance window.
Technical support is available via our 24/7 helpdesk or through Cisco’s official support portal for Cisco ISR products.
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