The **M400320B2PK-R** is a specific high-performance memory module manufactured by **Micron Technology**. It belongs to the **DDR5 SDRAM** (Double Data Rate 5) family, designed for high-end server and workstation applications. --- ### 1. Key Technical Specifications The part number follows a specific nomenclature used by Micron to define the hardware architecture of the module. | Feature | Specification | | :--- | :--- | | **Memory Type** | DDR5 SDRAM | | **Form Factor** | RDIMM (Registered DIMM) | | **Capacity** | 32 GB | | **Speed** | 4800 MT/s (PC5-4800) | | **Error Correction** | ECC (Error Correction Code) | | **Rank** | 2Rx8 (Dual Rank) | | **Voltage** | 1.1V | | **CAS Latency** | CL40 | --- ### 2. Major Electronic Components A modern DDR5 RDIMM like this one is more complex than older generations because it moves power management and logic from the motherboard directly onto the module. #### A. DRAM Chips (SDRAM) * **Function:** The actual storage cells. * **Technology:** These are Micron's high-density DDR5 chips. Being **2Rx8**, the module uses 16 memory chips (8 per rank) to achieve the 32GB capacity while maintaining high data throughput. #### B. RCD (Registering Clock Driver) * **Function:** This chip acts as a "buffer" for command and address signals between the CPU's memory controller and the DRAM chips. * **Importance:** It reduces the electrical load on the CPU, allowing for high capacities and stability in server environments. #### C. PMIC (Power Management Integrated Circuit) * **Function:** Unlike DDR4, which received regulated power from the motherboard, DDR5 modules like the M400320B2PK-R have an onboard PMIC. * **Benefit:** It converts the 12V or 5V input from the system into the precise 1.1V required by the DRAM. This improves power efficiency and reduces signal noise. #### D. SPD Hub / Thermal Sensor * **Function:** Contains the **Serial Presence Detect (SPD)** EEPROM which stores the module's timings and identification. * **Thermal Monitoring:** It integrates a high-precision thermal sensor to report real-time temperature data to the system, preventing overheating. --- ### 3. Key Electronic Advantages 1. **On-die ECC:** In addition to the module-level ECC, the individual DRAM chips have internal error correction, significantly increasing data reliability. 2. **Dual 32-bit Subchannels:** DDR5 splits the 64-bit data bus into two independent 32-bit channels, improving bus efficiency and reducing latency for multi-core processors. 3. **Increased Prefetch:** It utilizes a 16n prefetch architecture, doubling the data burst length compared to DDR4. ---