The **M3H64FBD-R** refers to a high-speed, high-density DDR3 SDRAM memory module manufactured by **SK Hynix**. This specific part is commonly found in server environments and high-performance workstations. --- ### 1. Technical Specifications The following table outlines the primary electronic characteristics of the M3H64FBD-R: | Parameter | Specification | | :--- | :--- | | **Memory Type** | DDR3 SDRAM | | **Module Type** | RDIMM (Registered DIMM) | | **Capacity** | 16 GB | | **Speed** | 1600 MT/s (PC3-12800) | | **Voltage** | 1.5V (Standard) / 1.35V (Low Voltage variant) | | **Rank** | 2Rx4 (Dual Rank) | | **ECC Support** | Yes (Error Correction Code) | | **Pin Count** | 240-pin | --- ### 2. Key Electronic Components This module is composed of several critical integrated circuits (ICs) that work together: #### A. DRAM Chips (SDRAM) The module uses multiple DRAM chips (likely H5TC4G43BFR or similar). These chips store the actual data bits. Because it is a **2Rx4** configuration, it uses x4 organization chips distributed across two logical ranks. #### B. The Register (RCD) The "R" in the suffix indicates it is a **Registered** module. It includes a Registering Clock Driver (RCD) chip. - **Function:** It buffers the command and address signals between the memory controller and the DRAM chips. - **Benefit:** This reduces the electrical load on the system memory controller, allowing for higher capacities and more modules per channel. #### C. SPD EEPROM A small Serial Presence Detect (SPD) chip is located on the PCB. - **Function:** It stores information about the module’s timings, voltage, and manufacturer data. - **Benefit:** The system BIOS reads this chip during boot to automatically configure memory settings. #### D. Thermal Sensor (Optional) Many modules in this series include an integrated digital thermal sensor to monitor the operating temperature and prevent overheating during heavy server workloads. --- ### 3. Usage Context Because this is an **ECC RDIMM**, it is electronically incompatible with standard consumer motherboards (like those for Intel Core i5/i7 or AMD Ryzen). It is strictly designed for: * **Server Platforms:** Intel Xeon or AMD EPYC/Opteron systems. * **Workstations:** Systems requiring high data integrity and stability. ---