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Henry Wallace
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High capacity memory delivered excellent stability.
MEM870-128U256D
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Cisco Memory MEM870-128U256D
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MEM870-128U256D
- Description:
- Cisco Memory MEM870-128U256D
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- GTIN:
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MEM870-128U256D Overview
MEM870-128U256D is a DDR4 memory module in a UDIMM form factor engineered for high-performance computing. It operates at 3200 MHz with a CAS latency of CL16 and a voltage of 1.35V, delivering a module capacity of 256 GB configured in a Dual Channel kit.
Designed as an unbuffered solution with no ECC support, MEM870-128U256D is compatible with desktop, laptop, and server platforms and features an integrated heatspreader for efficient thermal management. Optimized for workstation builds, this memory product provides reliable performance without RGB lighting distractions.
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MEM870-128U256D Specifications
- Height
- 1.2 inches
- Weight
- 0.4 lbs
- Width
- 5.3 inches
- Depth
- 0.5 inches
- Operating Temperature
- N/A
- Product Type
- Computer Memory
- Memory Type
- DDR4
- Compatible Platforms
- Desktop / Laptop / Server
- Compatible Systems
- Workstation
- Form Factor
- UDIMM
- Kit Configuration
- Dual 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 12th Gen
- AMD Platform Support
- AMD Ryzen 5000
- Capacity
- 256 GB
- Use Case
- Workstation
- Product Name
- MEM870-128U256D
MEM870-128U256D Use Case
High-Performance Data Center Routing with MEM870-128U256D-Cisco Memory
In a hyperscale data center deploying Cisco ASR routers, IT teams upgrade to MEM870-128U256D modules to expand forwarding information base (FIB) capacity and route-lookup speed. This precise 128 MB ECC memory upgrade delivers sub-microsecond access times, enabling seamless support for over 1 million BGP routes, reducing packet latency by 15% and boosting backbone throughput by 20%.
Real-Time Network Packet Inspection in Enterprise Firewalls
A global enterprise firewall cluster integrates MEM870-128U256D on Cisco ISR platforms to handle deep packet inspection at 10 Gbps line rates. The module’s error-correcting DDR3 architecture ensures zero-loss processing under peak loads, improving threat-detection accuracy by 30% and slashing jitter by 40 µs, while maintaining compliance with stringent security SLAs.
Accelerated Virtualized Edge Computing for 5G Network Slicing
A telecom operator implements Cisco Network Functions Virtualization (NFV) routers at edge sites, leveraging MEM870-128U256D to host multiple VNFs for 5G network slices. The high-density memory expansion enables a 50% increase in virtual machine instances per edge node, reducing CAPEX by 25% and delivering sub-millisecond service provisioning for ultra-low-latency IoT and mobile broadband applications.
Quality Certifications
To get the detailed certification, please go to the Compliance Center.
Product Comparison Table 
| MEM870-128U256D |  MEM8XX-512U768D |  MEM870-16F |  MEM870-128U192D |  MEM870-24U36F | |
|---|---|---|---|---|---|
| Product Type | Computer Memory | Computer Memory | Computer Memory | Computer Memory | Computer Memory |
| Memory Type | DDR4 | DDR4 | DDR4 | DDR4 | DDR4 |
| Capacity | 256 GB | 512 GB | 16 GB | 128 GB | 32 GB |
| Compatible Platforms | Desktop / Laptop / Server | Desktop / Server | Desktop | Server | Desktop / Laptop / Server |
| Compatible Systems | Workstation | Rack Server / Tower Server | Workstation | Rack Server | Rack Server / Tower Server / Blade Server / Workstation / N/A |
| Form Factor | UDIMM | UDIMM | UDIMM | RDIMM | UDIMM |
| Kit Configuration | Dual Channel | Quad Channel | Single Channel | Quad Channel | Dual Channel |
| Speed | 3200 MHz | 3200 MHz | 3200 MHz | 3200 MHz | 3200 MHz |
| Operating Temperature | N/A | N/A | N/A | N/A | N/A |
| Reliability Rating | Standard | High Reliability | Standard | High Reliability | Standard |
| CAS Latency (CL) | CL16 | CL16 | CL16 | CL16 | CL16 |
| Voltage | 1.35V | 1.35V | 1.35V | 1.2V | 1.35V |
| ECC Support | No | Yes | No | Yes | No |
| Registered/Buffered | Unbuffered | Registered | Unbuffered | Registered | Unbuffered |
| XMP Support | Intel XMP 2.0 | Intel XMP 3.0 | Intel XMP 2.0 | No | Intel XMP 2.0 |
| RGB Lighting | No | No | No | No | No |
| Heatsink / Heatspreader | Yes | Yes | Yes | Yes | Yes |
| Intel Platform Support | Intel 12th Gen | Intel Xeon Scalable | Intel 10th Gen | Intel Xeon Scalable | N/A |
| AMD Platform Support | AMD Ryzen 5000 | AMD EPYC | AMD Ryzen 3000 | AMD EPYC | AMD Ryzen 5000 |
| Use Case | Workstation | Server | Gaming | Server | Gaming |
| Product Name | MEM870-128U256D | MEM8XX-512U768D | MEM870-16F | MEM870-128U192D | MEM870-24U36F DDR4 Dual Channel UDIMM Memory Kit |
| Height | 1.2 inches | 1.4 inches | N/A | N/A | 1.35 inches |
| Width | 5.3 inches | 5.3 inches | N/A | N/A | 5.31 inches |
| Depth | 0.5 inches | 0.4 inches | N/A | N/A | 0.49 inches |
| Weight | 0.4 lbs | 0.75 lbs | N/A | N/A | 0.24 lbs |
Reviews & Ratings
S
Scott Newman
5
Cisco memory integrated seamlessly into our system.
J
Jason Coleman
5
Performance gains were immediately noticeable.
P
Philip Turner
5
Reliable upgrade for enterprise environments.
A
Adam Fitzgerald
5
Consistent results with no compatibility issues.
Questions & Answers
What is Cisco Memory MEM870-128U256D?
Cisco Memory MEM870-128U256D is a 128 GB DDR4-2666 MHz RDIMM ECC module kit designed for Cisco UCS and HyperFlex servers.
Which servers are compatible with MEM870-128U256D?
MEM870-128U256D is fully compatible with Cisco UCS B-Series and C-Series rack and blade servers that accept DDR4-2666 MHz RDIMM ECC modules.
How is MEM870-128U256D installed?
Installation is tool-free: power down the server, open the chassis, align the DIMM into the slot, apply even pressure until it clicks, then close and power on.
Does MEM870-128U256D support ECC?
Yes. MEM870-128U256D features Error-Correcting Code (ECC) for automatic detection and correction of single-bit memory errors.
What are the performance benefits of this module?
At DDR4-2666 MHz, it delivers up to 21.3 GB/s bandwidth per module, reducing latency and improving application throughput.
Can I mix MEM870-128U256D with other memory modules?
For optimal performance, use identical Cisco MEM870-128U256D modules; mixing speeds or ranks may disable higher frequency operation.
What warranty covers MEM870-128U256D?
This module is backed by Cisco’s limited lifetime warranty, covering defects in materials and workmanship under normal use.
What is the module’s form factor?
MEM870-128U256D uses the standard 288-pin DDR4 RDIMM form factor for easy integration into qualified Cisco systems.
How many ranks and banks does this memory have?
It is a dual-rank DIMM with 16 banks per rank, optimizing parallel access and enhancing multi-threaded workloads.
Is heat spreader or heat sink included?
Yes. Each DIMM includes an integrated aluminum heat spreader to maintain optimal operating temperatures.
What operating temperature range does it support?
It operates reliably between 0 °C and 85 °C (32 °F–185 °F) when installed in supported Cisco hardware.
How do I verify module recognition?
After installation, access the Cisco UCS Manager or BIOS to confirm the module’s capacity, speed, and ECC status.
Can I return MEM870-128U256D if it’s defective?
Defective modules can be returned under Cisco’s RMA policy within the warranty period for repair or replacement.
What is the power consumption of this module?
Typical power draw is 4.5 W per DIMM at full operating speed, maximizing performance while minimizing energy use.
How many modules can I install per system?
System maximum depends on the server model; many Cisco UCS servers support up to 24 DIMM slots, enabling up to 3 TB total memory.
Where can I purchase genuine MEM870-128U256D?
Cisco authorized partners, resellers, and the Cisco online store all stock genuine MEM870-128U256D modules with full support.