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MEM-2900-512MB
512MB DRAM (1 DIMM) for Cisco 2901, 2911, 2921 ISR, Spare
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MEM-2900-512MB is a high-performance DDR4 UDIMM memory module operating at 2933 MHz with a CAS latency of CL16 and a standard voltage of 1.2V. This module offers a capacity of 512 MB in a single channel kit configuration, is non-ECC and unbuffered, and is engineered primarily for desktop and server systems.
Designed with an integrated heatspreader for effective thermal management, the MEM-2900-512MB module delivers consistent performance for workstation builds. Although it does not feature RGB lighting, its specifications make it well-suited for applications where reliability and efficiency are paramount.
MEM-2900-512MB price is $168.00, a 63.5% saving from the Cisco list price of $460.00. MEM-2900-512MB is in stock and available for next-day dispatch. (terms applied)
Request bulk order quote for MEM-2900-512MB for additional pricing. Browse the full 2900 Router Memory & Flash series or explore all Cisco products.
A mid-sized retailer operating 40 regional outlets installed MEM-2900-512MB DRAM into its Cisco 2911 routers to support 25 simultaneous IPsec VPN tunnels. The additional memory eliminated encryption buffer bottlenecks, delivering a 35 % increase in throughput and sustaining 99.9 % uptime for secure data synchronization.
A financial services firm upgraded its Cisco 2901 ISR with MEM-2900-512MB DRAM to run Cisco IOS Firewall and intrusion prevention in parallel. The extra memory accommodated threat-signature databases and real-time analytics, reducing malware detection latency by 45 % and ensuring compliance with industry security mandates.
An enterprise unified-communications deployment added MEM-2900-512MB DRAM to its Cisco 2921 routers to handle MPLS QoS policies for voice and video streams. The upgrade buffered routing tables and QoS processes, cutting jitter by 50 % and boosting call-quality MOS scores above 4.0 for 200 concurrent users.
Mon–Fri: [09:00-16:00]
Avg. response under 30 mins
| MEM-2900-512MB |  MEM-2900-2GB |  MEM-2951-512U4GB |  MEM-2900-512U2.5GB |  MEM-2900-1GB | |
|---|---|---|---|---|---|
| Product Type | Computer Memory | Computer Memory | Computer Memory | Computer Memory | Computer Memory |
| Memory Type | DDR4 | DDR4 | DDR4 | DDR4 | DDR3 |
| Capacity | 512 MB | 2 GB | 4 GB | 512 GB | 1 GB |
| Compatible Platforms | Desktop / Server | Desktop / Laptop / Server | Desktop / Laptop / Server | Desktop / Server | Desktop |
| Form Factor | UDIMM | UDIMM | UDIMM | UDIMM | UDIMM |
| Kit Configuration | Single Channel | Single Channel | Single Channel | Single Channel | Single Channel |
| Speed | 2933 MHz | 2933 MHz | 3200 MHz | 3200 MHz | 1600 MHz |
| Reliability Rating | Standard | Standard | Standard | Standard | Standard |
| CAS Latency (CL) | CL16 | CL16 | CL16 | CL16 | CL11 |
| Voltage | 1.2V | 1.2V | 1.35V | 1.35V | 1.5V |
| 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 | No | No |
| RGB Lighting | No | No | No | No | No |
| Heatsink / Heatspreader | Yes | No | Yes | Yes | Yes |
| Use Case | Workstation | General Use | Gaming / Workstation | Server | General Use |
| Product Name | MEM-2900-512MB | MEM-2900-2GB | MEM-2951-512U4GB | MEM-2900-512U2.5GB | MEM-2900-1GB |
| Height | 1.2 inches | 1.18 inches | 1.2 inches | 1.2 inches | 1.2 inches |
| Width | 5.3 inches | 5.25 inches | 5.3 inches | 5.3 inches | 5.3 inches |
| Depth | 0.5 inches | 0.12 inches | 0.5 inches | 0.3 inches | 0.2 inches |
| Weight | 0.2 lbs | 0.2 lbs | 0.3 lbs | 0.5 lbs | 0.15 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.
Exact replacement DIMM for ISR 2900 routers.
Cisco memory maintained system stability.
Worked without any issues.
Good spare for legacy hardware.
Reliable basic memory option.
The MEM-2900-512MB is a genuine Cisco 512MB DRAM 1 DIMM designed to expand memory on Cisco 2901, 2911, and 2921 Integrated Services Routers.
The 512MB DRAM (1 DIMM) is fully compatible with Cisco 2901, Cisco 2911, and Cisco 2921 ISR platforms.
Power off the router, open the chassis, insert the DIMM into the DRAM slot until it clicks, close the chassis, and power on.
Upgrading to 512MB DRAM enhances CPU throughput, supports additional services, and improves overall packet processing performance on ISR 2901, 2911, and 2921.
No, the 512MB DRAM module requires a complete power cycle; hot-swapping is not supported.
No, this DRAM upgrade is transparent to Cisco IOS; no firmware or software updates are required.
The module is a 512MB DDR2 DRAM with a standard operating frequency that matches Cisco 2900 Series requirements.
No, the router automatically recognizes the new memory; no manual configuration is needed.
No, each Cisco 2901, 2911, or 2921 ISR supports only one 512MB DRAM DIMM in the dedicated slot.
This genuine Cisco spare is backed by Cisco’s standard limited hardware warranty, covering defects in materials and workmanship.
Ensure the router is powered off, verify the DIMM is seated correctly, check for bent pins, then power on and view memory stats via “show version.”
You can buy the MEM-2900-512MB through authorized Cisco partners, resellers, or the Cisco online store.
Installing the 512MB DRAM module increases total system memory to 768MB on a Cisco 2921 ISR when combined with the onboard memory.
The module ships in anti-static packaging with protective foam and Cisco branding to prevent damage during transit.
Yes, the MEM-2900-512MB is an authentic, Cisco-manufactured DRAM module designed for Cisco ISR 2900 Series routers.
After powering on, enter “show version” or “show memory summary” in Cisco IOS; the output will reflect the additional 512MB.
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