United States$5,000,000+
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Carlos Bennett
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Large flash upgrade handled multiple IOS images easily.
MEM-CF-256U4GB
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256MB to 4GB Compact Flash Upgrade for Cisco 1900,2900,3900
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Name:
MEM-CF-256U4GB
- Description:
- 256MB to 4GB Compact Flash Upgrade for Cisco 1900,2900,3900
- Rating:
Added to cart 28 times recently
- Availability:
In stock - Ready to Ship
- Brand:
- Cisco
- GTIN:
- 818249751610
- Condition:
- Warranty:
- 3
- List Price:
$1,656.00
- Price:
$578.0065.1% off
Quantity:
1
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MEM-CF-256U4GB Overview
MEM-CF-256U4GB is a DDR4 UDIMM engineered for high-performance desktop and server builds. This memory module features a 256 GB capacity delivered via a Quad Channel kit configuration, operating at 3200 MHz speed with a CAS latency of CL16 and a voltage of 1.35V, while being non-ECC and unbuffered to ensure efficient performance in workstations.
Designed with an integrated heatspreader for optimal thermal management and built without RGB lighting, MEM-CF-256U4GB is perfectly suited for professional workstation and server applications. Its compatibility with Intel 12th Gen and AMD Ryzen 5000 platforms makes it a reliable choice for demanding overclocking and high-performance computing tasks.
MEM-CF-256U4GB price is $578.00, a 65.1% saving from the Cisco list price of $1,656.00. MEM-CF-256U4GB is in stock and available for next-day dispatch. (terms applied)
Request bulk order quote for MEM-CF-256U4GB for additional pricing. Browse the full 1900 & 2900 & 3900 Series Router Flash Memory series or explore all Cisco products.
MEM-CF-256U4GB Specifications
- Height
- 1.3 inches
- Width
- 5.3 inches
- Weight
- 0.3 lbs
- Depth
- 0.2 inches
- Operating Temperature
- N/A
- Product Type
- Computer Memory
- Memory Type
- DDR4
- Compatible Systems
- Workstation
- Form Factor
- UDIMM
- 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 12th Gen
- AMD Platform Support
- AMD Ryzen 5000
- Compatible Platforms
- Desktop / Server
- Kit Configuration
- Quad Channel
- Capacity
- 256 GB
- Use Case
- Workstation
- Product Name
- MEM-CF-256U4GB
MEM-CF-256U4GB Use Case
Branch Office Business Continuity with MEM-CF-256U4GB-256MB to 4GB Upgrade
In a nationwide retail chain deploying Cisco 1900 routers in 150 branch locations, upgrading the embedded 256MB Compact Flash to 4GB (MEM-CF-256U4GB-256MB to 4GB) enables storage of dual IOS images, full configuration backups, and local event logs. This ensures sub-minute failover when primary firmware is corrupted and accelerates recovery, delivering 99.9% network availability and reducing on-site maintenance costs.
Security Logging & Compliance Archiving on Cisco 2900/3900 Routers
A financial services firm uses Cisco 2900 and 3900 series routers to aggregate branch office traffic and must retain syslog, NetFlow, and packet-capture data for 90-day audits. By installing the MEM-CF-256U4GB-256MB to 4GB Compact Flash upgrade, each router securely stores high-volume logs locally, supporting automated off-peak transfers to SIEM systems and ensuring PCI DSS and SOX compliance with zero packet loss during peak trading hours.
Advanced QoS, Modular Features & IP SLA on Cisco 3900 Platforms
An enterprise campus network running Cisco 3900 routers requires granular Quality of Service, IP SLA probes, and application-aware services for VoIP and video conferencing. Upgrading from 256MB to 4GB Compact Flash (MEM-CF-256U4GB-256MB to 4GB) provides the file system capacity to host large QoS policy templates, extended performance routing databases, and firmware images for modular feature sets. The result is sub-5ms jitter for voice, dynamic path selection for critical applications, and simplified version control for network automation.
Quality Certifications
To get the detailed certification, please go to the Compliance Center.
Product Comparison Table 
| MEM-CF-256U4GB |  MEM-CF-2GB |  MEM-CF-4GB= |  MEM-CF-256U512MB |  MEM-CF-1GB= | |
|---|---|---|---|---|---|
| Product Type | Computer Memory | Computer Memory | Computer Memory | Computer Memory | Computer Memory |
| Memory Type | DDR4 | DDR4 | DDR4 | DDR4 | DDR4 |
| Capacity | 256 GB | 2 GB | 4 GB | 512 GB | 8 GB |
| Compatible Platforms | Desktop / Server | Desktop | Desktop / Laptop / Server | Desktop / Laptop / Server | Desktop |
| Compatible Systems | Workstation | Tower Server | Workstation | Tower Server | N/A |
| Form Factor | UDIMM | UDIMM | UDIMM | UDIMM | UDIMM |
| Kit Configuration | Quad Channel | Single Channel | Single Channel | Single Channel | Single Channel |
| Speed | 3200 MHz | 2400 MHz | 3200 MHz | 3200 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 | CL16 | CL16 | CL16 |
| Voltage | 1.35V | 1.35V | 1.2V | 1.35V | 1.2V |
| ECC Support | No | No | No | No | No |
| Registered/Buffered | Unbuffered | Unbuffered | Unbuffered | Unbuffered | Unbuffered |
| XMP Support | Intel XMP 2.0 | No | Intel XMP 2.0 | Intel XMP 2.0 | Intel XMP 2.0 |
| RGB Lighting | No | No | No | No | No |
| Heatsink / Heatspreader | Yes | Yes | Yes | Yes | Yes |
| Intel Platform Support | Intel 12th Gen | N/A | Intel 12th Gen | Intel 12th Gen | Intel 12th Gen |
| AMD Platform Support | AMD Ryzen 5000 | N/A | AMD Ryzen 5000 | AMD Ryzen 5000 | AMD Ryzen 5000 |
| Use Case | Workstation | Gaming | Gaming | Gaming | Gaming |
| Product Name | MEM-CF-256U4GB | MEM-CF-2GB | MEM-CF-4GB= | MEM-CF-256U512MB | MEM-CF-1GB DDR4 8GB UDIMM |
| Height | 1.3 inches | N/A | 1.4 inches | 1.2 inches | 1.25 inches |
| Width | 5.3 inches | N/A | 5.3 inches | 5.3 inches | 5.25 inches |
| Depth | 0.2 inches | N/A | 0.5 inches | 0.2 inches | 0.14 inches |
| Weight | 0.3 lbs | N/A | 0.25 lbs | 0.3 lbs | 0.1 lbs |
Reviews & Ratings
V
Victor Hughes
4
Cisco flash delivered stable and fast access.
D
Daniel Prescott
5
Excellent option for ISR upgrades.
A
Anthony Miller
5
No compatibility issues and smooth performance.
R
Robert Sinclair
5
Reliable storage upgrade for enterprise routers.
Questions & Answers
What is the MEM-CF-256U4GB Compact Flash Upgrade for Cisco 1900, 2900, 3900?
The MEM-CF-256U4GB is a high-performance Compact Flash card that upgrades Cisco 1900, 2900, and 3900 series routers from 256 MB to 4 GB of storage for IOS images, logs, and configurations.
Which Cisco router models are compatible with the MEM-CF-256U4GB upgrade?
This Compact Flash upgrade is fully compatible with Cisco ISR 1900, 2900, and 3900 series routers that support a standard Type I/II Compact Flash slot.
How do I install the 256 MB to 4 GB Compact Flash in my Cisco router?
Power off the router, open the Compact Flash slot cover, insert the card until it clicks, secure the cover, and power on. The router will detect the new storage automatically.
Is the MEM-CF-256U4GB plug-and-play?
Yes. The upgrade is plug-and-play. After insertion and reboot, the router recognizes the additional capacity without manual driver installation.
Do I need to configure the router after installing the new Compact Flash?
No additional configuration is required. The router’s IOS will automatically detect the expanded storage during boot.
What are the read and write speeds of this Compact Flash upgrade?
The MEM-CF-256U4GB delivers sustained read speeds up to 45 MB/s and sustained write speeds up to 30 MB/s under typical network conditions.
How does increasing from 256 MB to 4 GB improve router performance?
Expanding storage enables larger IOS images, more extensive log files, and advanced feature sets, reducing memory bottlenecks and enhancing system stability.
What operating temperature range does the MEM-CF-256U4GB support?
The card operates reliably between –25 °C and 85 °C, meeting or exceeding Cisco environmental specifications for ISR platforms.
What warranty coverage comes with the MEM-CF-256U4GB Compact Flash?
This product includes a lifetime warranty against defects in materials and workmanship, ensuring long-term reliability.
Can I return the Compact Flash upgrade if it’s not compatible?
Yes. We offer a 30-day, no-questions-asked return policy. Simply contact support for return authorization and instructions.
Is the MEM-CF-256U4GB compatible with Cisco IOS feature sets?
Yes. The upgraded storage supports all Cisco IOS feature sets for ISR 1900, 2900, and 3900 series routers.
What accessories are included with the Compact Flash upgrade?
The package includes the MEM-CF-256U4GB card, an anti-static bag, installation guide, and warranty documentation.
Do I need special tools to install this Compact Flash card?
No special tools are required. A standard Phillips screwdriver may be used to remove the router’s slot cover.
How does the MEM-CF-256U4GB improve system reliability?
With higher endurance flash cells and error-correcting code (ECC), this card minimizes data corruption and extends device uptime.
What is the mean time between failures (MTBF) for this Compact Flash card?
The MEM-CF-256U4GB has an MTBF exceeding 2,000,000 hours, ensuring enterprise-grade reliability.
Where can I purchase the MEM-CF-256U4GB Compact Flash upgrade?
This product is available through our official online store and authorized Cisco resellers. Visit our website or contact sales for details.