Product Description
IBM EM4M 256 GB (2×128GB) DDIMMs, 4000 MHz or 4800 MHz, 16 Gbit DDR5 Memory
The IBM EM4M 256 GB (2×128GB) DDIMMs, 4000 MHz or 4800 MHz, 16 Gbit DDR5 Memory (CCIN 3298, part number 03HD815) is a high-density enterprise memory kit consisting of two 128 GB DDR5 Registered DIMMs (RDIMMs), providing a total of 256 GB capacity at 4000 MHz or 4800 MHz effective speed. This DDR5 memory is optimized for the latest IBM Power Systems servers (primarily Power10 and Power11 models), delivering significantly higher bandwidth, lower latency, and advanced RAS features compared to DDR4, ideal for demanding IBM i, AIX, and Linux workloads such as large-scale databases, virtualization, in-memory analytics, AI, ERP, and high-concurrency applications.
Product Description
The IBM EM4M (feature code EM4M) memory kit includes two 128 GB DDR5 RDIMMs (CCIN 3298, part number 03HD815 per DIMM) rated at 4000 MHz or 4800 MHz (model and configuration dependent) with ECC and advanced reliability features. These high-density modules use 16 Gbit DRAM chips to achieve 128 GB per DIMM, enabling efficient scaling to terabytes of memory in Power10/Power11 systems. The memory supports IBM Power10/Power11's next-generation DDR5 subsystem, including chipkill, lane sparing, dynamic sparing, predictive failure analysis, transparent memory encryption (in supported configs), and full compatibility with PowerVM logical partitioning, IBM i native memory management, and AIX/Linux large-page/hugepage support. The EM4M kit is qualified for high performance and RAS in Power10 (e.g., S1024/9105-42A) and Power11 models, providing a substantial bandwidth boost (up to ~50-100% over DDR4) for workloads requiring massive in-memory datasets (e.g., SAP HANA, Db2, Oracle, analytics platforms, AI training/inference).
Features
- 256 GB total capacity (2 × 128 GB RDIMMs) for high-density DDR5 configurations.
- DDR5 4000 MHz or 4800 MHz speed with ECC for error detection and correction.
- Advanced RAS: chipkill, lane sparing, dynamic sparing, predictive failure analysis.
- Support for PowerVM logical partitioning and memory overcommit.
- IBM i large page support and AIX/Linux hugepages compatibility.
- Hot-plug and concurrent maintenance in supported configurations.
- Higher bandwidth and efficiency than DDR4 (optimized for next-gen enterprise workloads).
- Full IBM qualification and firmware integration for Power10/Power11.
Technical Specifications
- Feature Code: EM4M (kit)
- CCIN: 3298 (per DIMM)
- Part Number: 03HD815 (per 128 GB DIMM)
- Capacity: 256 GB total (2 × 128 GB)
- Type: DDR5 Registered DIMM (RDIMM / DDIMM buffered)
- Speed: 4000 MHz or 4800 MHz (effective rate model-dependent)
- Rank: High-density (typically 8-rank or 16-rank per DIMM)
- Voltage: 1.1 V (standard DDR5)
- ECC: Yes, with chipkill support
- Form Factor: 288-pin DIMM
- DRAM Density: 16 Gbit per chip
- Compatibility: Power10 (e.g., S1024/9105-42A) and Power11 models supporting DDR5
Compatibility
The IBM EM4M 256 GB (2 × 128 GB) DDR5 Memory kit is compatible with:
- Power Systems Models:
- Power10: S1024 (9105-42A) and other DDR5-capable Power10 models (e.g., S1124/9824-42A, L1124/9856-42H in Power11 era; verify with IBM for exact support)
- Power11: S1124 (9824-42A), L1124 (9856-42H), and related models (primary DDR5 platform)
- Operating Systems: IBM i 7.4+ / 7.5+, AIX 7.3+, Linux (RHEL/SUSE/Ubuntu), VIOS
- Attachment: Dedicated DDIMM slots on system board (balanced population across processors required for optimal bandwidth and RAS)
- Memory Subsystem: Power10/Power11 DDR5 channels; requires matching DIMM population per IBM guidelines
- Limitations: DDR5-specific (not backward compatible with DDR4 Power10 models); requires latest firmware for full support; must follow IBM memory population guidelines for maximum performance and RAS; primarily for newer Power10/Power11 systems
Verify exact population rules, firmware levels, and OS requirements via IBM Sales Manual or resources for your specific Power Systems model.
Warranty
This product comes with a 60-day warranty covering parts and functionality.
