Maximize the memory capacity and performance of your Cisco UCS infrastructure with the Cisco UCS-MR-128G8RS-H 128GB DDR4-2666 ECC Registered Memory Module. Manufactured by Samsung under part number M393AAK40B42-CWD and Cisco part number UCS-MR-128G8RS-H (15-105085-01), this enterprise-grade memory module is engineered for virtualization, cloud computing, database applications, AI workloads, and high-performance data center environments.
Featuring 128GB of DDR4-2666 (PC4-21300V) memory, this module utilizes an advanced 2S4Rx4 / 8Rx4 Octal Rank architecture with 3DS (Three-Dimensional Stacking) technology to provide exceptional memory density while maintaining stability and reliability. Built with ECC (Error-Correcting Code) protection and registered buffering, it helps reduce data corruption and improve system uptime in mission-critical server deployments.
Operating at a low 1.2V, this 288-pin RDIMM delivers high bandwidth and energy-efficient performance, making it an ideal solution for Cisco UCS servers requiring ultra-high-capacity memory configurations.
Key Features
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Capacity: 128GB
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Manufacturer: Samsung (Cisco Branded)
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Cisco Part Number: UCS-MR-128G8RS-H
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Cisco PID: 15-105085-01
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Samsung Part Number: M393AAK40B42-CWD
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Memory Type: DDR4 ECC Registered (RDIMM)
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Speed: 2666MHz (PC4-21300V / PC4-2666V)
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Form Factor: 288-Pin DIMM
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Rank Configuration: 2S4Rx4 / 8Rx4 Octal Rank
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Technology: 3DS TSV Stacked Memory
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ECC Support: Yes
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Voltage: 1.2V
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Registered/Buffered: Yes (RDIMM)
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Application: Enterprise Servers, Data Centers, Cloud Infrastructure
Compatible Server Manufacturers
- Cisco UCS
- Dell PowerEdge
- HPE ProLiant & Apollo
- Lenovo ThinkSystem
- IBM Systems
- Fujitsu PRIMERGY
- Supermicro SuperServer
- ASUS Server Platforms
Popular Compatible Cisco UCS Models
- UCS C220 M5
- UCS C240 M5
- UCS C480 M5
- UCS B200 M5
- UCS B480 M5
- UCS C125 M5
- UCS S3260 M5
- UCS X-Series Compute Nodes
- Select Cisco HyperFlex Systems
Other Common Compatible Server Platforms
Dell
- PowerEdge R640
- PowerEdge R740 / R740xd
- PowerEdge R840
- PowerEdge R940 / R940xa
- PowerEdge C6420
- PowerEdge T640
HPE
- ProLiant DL360 Gen10
- ProLiant DL380 Gen10
- ProLiant DL560 Gen10
- ProLiant DL580 Gen10
- Apollo 2000 Gen10
- Apollo 4200 Gen10
Lenovo
- ThinkSystem SR630
- ThinkSystem SR650
- ThinkSystem SR850
- ThinkSystem SR860
- ThinkSystem SR950
- ThinkSystem SN550
- ThinkSystem SN850
Supermicro
- SuperServer 1029P-WTR
- SuperServer 2029P-C1R
- H11DSU-iN
- H11SSW-iN
Important Compatibility Notes
- Designed exclusively for enterprise-class servers and workstations
- Not compatible with desktop PCs, laptops, or consumer systems
- Requires platforms that support DDR4 ECC Registered (RDIMM) memory
- Cannot be mixed with UDIMM or LRDIMM memory modules
- Supports systems utilizing compatible Intel Xeon Scalable and AMD EPYC processors
- Due to the 8Rx4 Octal Rank design, verify server memory population guidelines before installation
Perfect for virtualization hosts, hyper-converged infrastructure, enterprise databases, cloud platforms, analytics engines, and mission-critical workloads, the Cisco UCS-MR-128G8RS-H / Samsung M393AAK40B42-CWD 128GB DDR4-2666 ECC RDIMM delivers the scalability, performance, and reliability required by modern enterprise data centers.
