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MEM-2900-512U2.5GB
512MB to 2.5GB DRAM Upgrade (2GB+512MB) for Cisco 2901-2921
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Pay by PayPal or Revolut with full chargeback rights. Order on PO terms, Net-30 for government.
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Since 2016, Enterprise-Trusted
Ten years serving buyers who audit their vendors. From federal agencies to 20,000+ enterprise clients worldwide.
MEM-2900-512U2.5GB is a high-performance DDR4 UDIMM engineered for demanding server and desktop environments. With a rated speed of 3200 MHz, a CAS latency of CL16, and an operating voltage of 1.35V, this non-ECC, unbuffered memory module delivers consistent performance for critical server builds while its integrated heatspreader ensures reliable thermal management even under sustained loads.
Designed for compatibility with both desktop and server platforms, MEM-2900-512U2.5GB comes in a single-channel kit configuration and supports Intel Xeon Scalable and AMD EPYC systems. Built without RGB lighting to focus on performance and reliability, this memory module is ideally suited for server applications where stability, speed, and efficient heat dissipation are essential.
MEM-2900-512U2.5GB price is $315.64, a 48% saving from the Cisco list price of $606.99. MEM-2900-512U2.5GB is in stock and available for next-day dispatch. (terms applied)
Request bulk order quote for MEM-2900-512U2.5GB for additional pricing. Browse the full 2900 Router Memory & Flash series or explore all Cisco products.
In a 200-user branch office running Cisco Unified Communications Manager on a Cisco 2901, the MEM-2900-512U2.5GB to 2.5GB DRAM Upgrade eliminates voice jitter and one-way audio during peak conferencing sessions. By expanding to 2.5 GB of DRAM, the router buffers high-volume RTP streams, supports 150+ concurrent calls, and unlocks advanced video and collaboration features. Outcome: 30% fewer dropped calls, crystal-clear audio/video quality, and future-proof UC performance.
A retail chain deploys Cisco 2921 routers with ASA firewall modules at 50+ locations. Upgrading with MEM-2900-512U2.5GB-512MB to 2.5 GB DRAM enables deep packet inspection, SSL decryption, and multi-context VPNs without throughput degradation. Result: firewall throughput rises by 40%, threat-signature updates process in real time, and PCI-DSS compliance is maintained under peak shopping loads.
An engineering firm uses Cisco 2901 routers for 100+ IPsec tunnels connecting global R&D centers. Installing the MEM-2900-512U2.5GB DRAM upgrade boosts encryption/decryption buffers, eliminating CPU stalls during high-volume key exchanges. Benefit: VPN throughput doubles to 200 Mbps, latency drops by 25%, and remote teams experience uninterrupted, low-lag access to CAD and SCM systems.
Mon–Fri: [09:00-16:00]
Avg. response under 30 mins
| MEM-2900-512U2.5GB |  MEM-2900-512U1GB |  MEM-2951-512U4GB |  MEM-2951-512U1.5GB |  MEM-2900-1GB | |
|---|---|---|---|---|---|
| Product Type | Computer Memory | Computer Memory | Computer Memory | Computer Memory | Computer Memory |
| Memory Type | DDR4 | DDR4 | DDR4 | DDR4 | DDR3 |
| Capacity | 512 GB | 512 GB | 4 GB | 512 GB | 1 GB |
| Compatible Platforms | Desktop / Server | Desktop / Server | Desktop / Laptop / Server | Desktop / Laptop / Server | Desktop |
| Form Factor | UDIMM | UDIMM | UDIMM | UDIMM | UDIMM |
| Kit Configuration | Single Channel | Single Channel | Single Channel | Single Channel | Single Channel |
| Speed | 3200 MHz | 2900 MHz | 3200 MHz | 3200 MHz | 1600 MHz |
| Reliability Rating | Standard | Standard | Standard | Standard | Standard |
| CAS Latency (CL) | CL16 | CL16 | CL16 | CL16 | CL11 |
| Voltage | 1.35V | 1.35V | 1.35V | 1.35V | 1.5V |
| ECC Support | No | No | No | No | No |
| Registered/Buffered | Unbuffered | Unbuffered | Unbuffered | Unbuffered | Unbuffered |
| XMP Support | No | No | Intel XMP 2.0 | Intel XMP 2.0 | No |
| RGB Lighting | No | No | No | No | No |
| Heatsink / Heatspreader | Yes | Yes | Yes | Yes | Yes |
| Use Case | Server | Workstation | Gaming / Workstation | Gaming / Workstation / Server | General Use |
| Product Name | MEM-2900-512U2.5GB | MEM-2900-512U1GB | MEM-2951-512U4GB | MEM-2951-512U1.5GB Memory Module | MEM-2900-1GB |
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.
Upgrade allowed additional services to run smoothly.
Cisco memory delivered stable performance.
Installation was quick and simple.
Good memory expansion for ISR 2900.
Reliable upgrade option.
The MEM-2900-512U2.5GB is a 512MB to 2.5GB DRAM memory upgrade kit that enhances Cisco 2901, 2911, and 2921 router performance by adding 2GB of verified DRAM.
This DRAM upgrade is fully compatible with Cisco Integrated Services Routers 2901, 2911, and 2921 running standard Cisco IOS.
By increasing total system memory from 512MB to 2.5GB, the upgrade supports more simultaneous processes, faster packet handling, and improved throughput.
The kit includes a factory-tested 2GB DRAM module, installation instructions, and ESD-safe packaging for safe handling.
No additional firmware update is required; Cisco IOS dynamically recognizes the new DRAM upon reboot.
Power off the router, ground yourself to prevent static damage, open the chassis, replace the existing DRAM with the new module, and then power on.
No, the upgrade uses Cisco-approved DRAM modules and maintains your original hardware warranty.
Yes, each DRAM module undergoes rigorous factory testing for compatibility and reliability before shipping.
The kit includes a lifetime replacement warranty covering defects in materials and workmanship under normal use.
Standard shipping delivers within 3–5 business days in the continental U.S.; expedited options are also available.
Yes, we offer a 30-day money-back guarantee; products must be unused and in original packaging.
Our kit meets or exceeds Cisco OEM specifications at a lower cost while ensuring full compatibility and warranty compliance.
No, always power down the router and disconnect all cables before servicing memory to avoid hardware damage.
You can expect up to 50% faster application response times and smoother operation under heavy traffic loads.
Yes, our certified network engineers provide step-by-step installation support and troubleshooting via phone or email.
You can order online directly from our website or through authorized resellers listed on our partner page.
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