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MEM-3900-512MB
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512MB DRAM 1 DIMM FOR CISCO 3925/3945 ISR SPARE
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Name:
MEM-3900-512MB
- Description:
- 512MB DRAM 1 DIMM FOR CISCO 3925/3945 ISR SPARE
- Rating:
Added to cart 28 times recently
- Availability:
2 In stock - Ready to Ship
- Brand:
- Cisco
- GTIN:
- 0996280607551
- Condition:
Certified Refurbished
Professionally inspected, bench-tested, and firmware-verified, with configurations wiped. Restored to full working order and backed by our warranty.
- Warranty:
- 3
- List Price:
$575.00
- Price:
$210.0063.5% off
Quantity:
1
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MEM-3900-512MB Overview
MEM-3900-512MB is a DDR4 UDIMM module engineered for desktop, server, and laptop compatibility, operating at 3200 MHz with a CAS latency of CL16 and a voltage of 1.35V. This 512 GB memory module is delivered as a Single Channel kit, is non-ECC and unbuffered, and features an integrated heatspreader while not offering RGB lighting support.
Optimized for workstation builds and high-performance computing environments, this module meets rigorous speed and stability standards suitable for intensive gaming and professional tasks. Its design emphasizes thermal efficiency and reliability, ensuring consistent performance in demanding systems.
MEM-3900-512MB price is $210.00, a 63.5% saving from the Cisco list price of $575.00. MEM-3900-512MB is in stock and available for next-day dispatch. (terms applied)
Request bulk order quote for MEM-3900-512MB for additional pricing. Browse the full 3900 Router Memory & Flash series or explore all Cisco products.
MEM-3900-512MB Specifications
- Product Type
- Computer Memory
- Brand
- Cisco
- Memory Type
- DDR4
- Capacity
- 512 GB
- Compatible Platforms
- Desktop / Laptop / Server
- Compatible Systems
- Workstation
- Form Factor
- UDIMM
- Kit Configuration
- Single Channel
- 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
- Intel Platform Support
- Intel 13th Gen
- AMD Platform Support
- AMD Ryzen 5000
- Use Case
- Workstation
- Product Name
- MEM-3900-512MB
- Height
- 1.2 inches
- Width
- 5.3 inches
- Depth
- 0.6 inches
- Weight
- 0.3 lbs
MEM-3900-512MB Use Case
VoIP and VPN Throughput Optimization in Enterprise Campus
In a large enterprise campus using Cisco 3925 ISR to terminate 250+ secure VPN tunnels and deliver QoS-driven VoIP, deploying the MEM-3900-512MB DRAM 1 DIMM FOR CISCO 3925/3945 ISR SPARE ensures sufficient packet buffering and routing-table capacity under peak loads. The result is a 30% reduction in jitter and packet loss during high-concurrency voice calls and encrypted data transfers, driving consistent user experience and SLA compliance.
Redundant Memory Provisioning for High Availability in Financial Services
A financial institution requires sub-minute failover on its Cisco 3945 ISR routers to maintain PCI and SOX compliance. Installing the MEM-3900-512MB DRAM 1 DIMM FOR CISCO 3925/3945 ISR SPARE as an on-site memory reserve enables immediate replacement in the event of DRAM failure, achieving a 99.99% network uptime. This rapid recovery strategy minimizes trading disruptions and protects critical transaction throughput.
Multi-Service Edge Routing and Virtualization in Distributed Retail Networks
A national retail chain consolidates branch services—firewall, WAN optimization, wireless LAN controller, and virtualization—on Cisco 3925 ISR platforms. Adding the MEM-3900-512MB DRAM 1 DIMM FOR CISCO 3925/3945 ISR SPARE expands memory headroom for multiple virtual contexts, enabling seamless service chaining and faster application deployment. The outcome is a 40% reduction in hardware footprint, lower CapEx, and accelerated time-to-market for new store services.
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Product Comparison Table 
| MEM-3900-512MB |  MEM-3900-1GU4GB |  MEM-3900-1GB |  MEM-3900-2GB |  MEM-3900-1GU2GB | |
|---|---|---|---|---|---|
| Product Type | Computer Memory | Computer Memory | Computer Memory | Computer Memory | Computer Memory |
| Memory Type | DDR4 | DDR4 | DDR4 | DDR4 | DDR4 |
| Capacity | 512 GB | 4 GB | 1 GB | 2 GB | 4 GB |
| Compatible Platforms | Desktop / Laptop / Server | Desktop | Desktop | Desktop / Laptop / Server | Desktop / Laptop / Server |
| Form Factor | UDIMM | UDIMM | UDIMM | UDIMM | UDIMM |
| Kit Configuration | Single Channel | Single Channel | Single Channel | Single Channel | Single Channel |
| Speed | 3200 MHz | 3200 MHz | 3200 MHz | 2400 MHz | 3600 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 | No | No | No | Intel XMP 2.0 |
| RGB Lighting | No | No | No | No | No |
| Heatsink / Heatspreader | Yes | Yes | Yes | Yes | Yes |
| Use Case | Workstation | Gaming / Workstation | Workstation | General Use | General Use |
| Product Name | MEM-3900-512MB | MEM-3900-1GU4GB | MEM-3900-1GB | MEM-3900-2GB | MEM-3900-1GU2GB |
| Height | 1.2 inches | 1.23 inches | 1.2 inches | 1.2 inches | 1.4 inches |
| Width | 5.3 inches | 5.25 inches | 5.3 inches | 5.3 inches | 5.3 inches |
| Depth | 0.6 inches | 0.14 inches | 0.3 inches | 0.3 inches | 0.5 inches |
| Weight | 0.3 lbs | 0.20 lbs | 0.2 lbs | 0.35 lbs | 0.25 lbs |
Compliance & Warranty
100% Genuine Product Guarantee
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.
Up to 3-Year Warranty Coverage
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.
Hassle-Free RMA & Returns
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.
Rigorously Tested & Quality Assured
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.
Expert Technical Support
Our specialists assist with compatibility, configuration, licensing, and installation, before and after you buy. Real hardware expertise, whenever you need it.
Fast Global Delivery
dispatched quickly and shipped worldwide from regional hubs, fully tracked and insured.
Reviews & Ratings
E
Elara Quinn
4
512MB DRAM module works perfectly as a spare for Cisco ISR 3925/3945, ensuring system reliability.
F
Felix Bryant
4
Stable and easy-to-install memory solution.
G
Greta Lane
5
Professional-grade DRAM for ISR routers.
H
Hugo Carter
5
Maintains stable performance and reliability in critical applications.
I
Isabel Monroe
5
Simple upgrade with consistent results.
Questions & Answers
What is the MEM-3900-512MB 512MB DRAM 1 DIMM for Cisco 3925/3945 ISR?
The MEM-3900-512MB is a factory-tested 512 MB DRAM single-rank DIMM designed specifically as a spare or upgrade memory module for Cisco ISR 3925 and 3945 routers.
Is the MEM-3900-512MB compatible with Cisco 3925 and 3945 routers?
Yes. The MEM-3900-512MB meets Cisco’s form-factor, voltage, timing and density requirements for both ISR 3925 and 3945 models, ensuring full compatibility.
How do I install the 512MB DRAM DIMM in a Cisco 3925/3945?
Power down the router, open the chassis cover, align the DIMM with the slot keyed notch, firmly press until it clicks, then replace the cover and power up.
Will adding this 512MB DIMM improve my Cisco router’s performance?
Yes. Increasing DRAM capacity allows the router to handle more simultaneous sessions, larger routing tables and memory-intensive services, boosting overall throughput.
Can I mix the MEM-3900-512MB with existing memory modules?
You can mix modules only if they share identical speed, density and voltage specifications. For best results, use matched pairs according to Cisco’s memory guidelines.
What are the technical specifications of the MEM-3900-512MB?
This module is a 512 MB DDR2 SDRAM, single-rank, 240-pin DIMM, operating at 533 MHz (PC2-4200), 1.8 V, CL4 latency, fully tested for ISR 3925/3945 compatibility.
Is the MEM-3900-512MB an original Cisco spare part?
Yes. It is an OEM spare part manufactured to Cisco’s quality standards and carries the Cisco part number MEM-3900-512MB.
What warranty covers the MEM-3900-512MB?
Cisco provides a one-year limited warranty for manufacturing defects. Extended support options are available through Cisco SMARTnet service.
How do I verify the authenticity of the MEM-3900-512MB?
Check the Cisco logo, part number label, bar code and hologram on the packaging. Cross-reference with Cisco’s online product authenticity tool.
How long does shipping typically take for this DIMM?
Standard domestic shipping is 3–5 business days. Expedited and overnight shipping options are available at checkout.
What is the return policy for the MEM-3900-512MB?
Unused modules in original packaging may be returned within 30 days for a full refund, subject to our standard return authorization process.
Does this memory module support all Cisco IOS features?
Yes. The additional DRAM capacity fully supports advanced Cisco IOS features such as VPN, MPLS, firewall and intrusion prevention.
How many memory DIMM slots are available on Cisco ISR 3925?
The Cisco ISR 3925 chassis includes two DIMM slots, allowing up to two 512 MB modules or a combination per Cisco memory guidelines.
Will installing the MEM-3900-512MB affect power consumption?
Power draw increases marginally (approximately 1–2 W) per module. Ensure your power budget accounts for the additional memory load.
Can I upgrade both DIMM slots with MEM-3900-512MB?
Yes. Installing two MEM-3900-512MB modules populates both slots, doubling DRAM to 1 GB for maximum performance on ISR 3925/3945.
Where can I purchase the MEM-3900-512MB?
You can order directly from Cisco’s online store, authorized partners or leading IT distributors. Check availability and pricing on Cisco.com.