Crucial 128GB DDR5 RDIMM

Brand: Crucial | Category: Memory (RAM)

SKU: CT128G5ERS48A.M8G | Part #: CT128G5ERS48A.M8G | MPN: CT128G5ERS48A.M8G

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A modern data centre with 12 DIMM slots per processor can accommodate six Crucial 128GB DDR5 RDIMM modules per CPU, yielding 768GB of memory per socket. On a dual-socket server platform, that translates to 1.5TB of total system memory—enough headroom for consolidated virtual machine workloads, in-memory databases, and large-scale AI inference clusters that have become standard in GCC enterprise deployments. The Crucial CT128G5ERS48A.M8G is purpose-built for this tier of deployment, delivering the capacity and stability that infrastructure teams have relied on across hyperscalers and mid-market data centres for nearly two years now.

Built on Micron Technology's proven DDR5 manufacturing foundation, the Crucial brand offers registered DIMM technology (RDIMM) specifically engineered for server reliability rather than consumer or workstation use. The CT128G5ERS48A.M8G operates at 4800 MT/s with CAS latency 40, balancing throughput against the inherent latency characteristics of first-generation DDR5 platforms. Unlike unbuffered consumer modules, the registered buffer on this DIMM isolates the control signals to the CPU, reducing electrical load and enabling deeper module populations in dual-socket and quad-socket configurations. For storage architects and AI infrastructure teams evaluating memory density against power consumption, this matters: Crucial's implementation runs at 1.1V, placing it at the efficiency edge of the DDR5 JEDEC envelope without sacrificing compatibility or long-term reliability margins.

Enterprise buyers specify Crucial DDR5 RDIMMs in two main scenarios: greenfield deployments on Intel Xeon Scalable processors (Sapphire Rapids generation and newer) and AMD EPYC platforms (Genoa and newer). Both processor families were validated against this module's on-die ECC (ODECC) implementation, which works in parallel with system-level ECC to catch and correct multi-bit errors before they propagate into application memory. Data centre managers who have run Crucial memory in previous generation platforms will recognize the 288-pin form factor and the standard RDIMM height—the CT128G5ERS48A.M8G installs without mechanical surprises or riser-card redesigns. The 2Rx4 rank configuration (two ranks per module, four chips per rank) is optimized for the memory controller design in current-generation Xeon and EPYC silicon, ensuring predictable performance across the full addressable range without requiring firmware tuning or BIOS workarounds.

In practice, sysadmins and procurement teams evaluating this module do so against two primary cost drivers: per-gigabyte memory expense and the thermal budget of the server chassis. The 128GB density per module reduces the number of physical slots consumed, which means fewer power delivery pins in the DIMM slot assembly, lower aggregate power draw in the memory subsystem, and—in dense blade deployments—easier cable routing and serviceability. Crucial's track record in deployed environments is transparent: no widespread firmware incompatibilities, no field returns due to manufacturing variance, and good availability across major distribution channels. The part number CT128G5ERS48A.M8G appears on validated compatibility lists from both Intel and AMD within weeks of platform launch, and it remains the non-volatile reference for engineers building Bill of Materials documentation.

Omnixon Global stocks the Crucial CT128G5ERS48A.M8G and related DDR5 RDIMM modules for immediate delivery across the GCC, with established logistics into Asia-Pacific and European data centre hubs. If you are building out memory capacity for Xeon or EPYC clusters, or need to validate inventory ahead of a large-scale infrastructure refresh, reach out with your requirements. We work with procurement teams, system integrators, and facility planners to ensure the right part reaches the right location on your timeline. Submit an RFQ to our team, and we will confirm availability, lead times, and commercial terms for your deployment.

Performance Specifications

• Capacity: 128GB per module; up to 768GB per CPU socket (six modules) or 1.5TB per dual-socket server
• Speed: 4800 MT/s (DDR5 JEDEC standard for Sapphire Rapids and Genoa)
• CAS Latency: CL40 (aligned with first-generation DDR5 controller timing)
• Voltage: 1.1V nominal (single power rail, no auxiliary supply required)
• Error Correction: On-die ECC plus system-level ECC for multi-layer fault tolerance
• Rank Configuration: 2Rx4 (optimized for Intel and AMD memory controllers)
• Operating Temperature: 0°C to 85°C; passive thermal margin suitable for standard data centre airflow
• JEDEC Compliance: Full DDR5 standard adherence ensures portability across validated platforms