The **M3A74FBG-R** is a specific part number belonging to a high-performance memory module (RAM), typically manufactured by **SK hynix**. This component is designed for server and workstation environments that require high reliability and speed. Below is a breakdown of the electronic specifications and characteristics of this part. --- ### 1. General Specifications The part is a **16GB DDR4 Registered DIMM (RDIMM)**. Here are the core technical details: | Attribute | Specification | | :--- | :--- | | **Manufacturer** | SK hynix | | **Memory Type** | DDR4 SDRAM | | **Capacity** | 16 GB | | **Module Type** | RDIMM (Registered DIMM) | | **Speed** | 2400 MT/s (PC4-19200) | | **Rank** | 2Rx8 (Dual Rank) | | **Error Correction** | ECC (Error Correcting Code) | | **Voltage** | 1.2V | | **Pin Count** | 288-Pin | --- ### 2. Key Electronic Components The module is an assembly of several critical integrated circuits (ICs) and passive components: #### A. DRAM Chips (The Storage Cells) The module uses **DDR4 SDRAM ICs**. Since it is a **2Rx8** configuration: * **Rank:** It has two logical ranks. * **Organization:** Each rank uses "x8" chips. * **Density:** To reach 16GB, it typically uses 8Gb (Gigabit) density chips. #### B. The Register (RCD) The "R" in the suffix indicates it is an **RDIMM**. * It contains a **Registering Clock Driver (RCD)** chip. * **Function:** This chip buffers the command and address signals between the memory controller and the DRAM chips. This reduces electrical loading on the system's memory bus, allowing for more DIMMs to be installed in a single server. #### C. Serial Presence Detect (SPD) EEPROM * A small 8-pin chip located on the PCB. * **Function:** It stores the module's timing parameters, manufacturer info, and serial number. The BIOS reads this via the I2C/SMBus protocol during startup to configure the memory controller. #### D. Decoupling Capacitors & Resistors * The PCB is populated with surface-mount (SMD) capacitors to filter power noise and maintain signal integrity at high frequencies (2400MHz). --- ### 3. Key Electronic Features * **ECC (Error Correcting Code):** The electronic circuitry includes extra data bits to detect and correct single-bit errors. This is vital for servers to prevent data corruption and system crashes. * **Low Voltage (1.2V):** Compared to DDR3 (1.5V), this part operates at 1.2V, which significantly reduces power consumption and heat dissipation in data centers. * **Termination:** Uses **On-Die Termination (ODT)** to prevent signal reflections on the data lines, ensuring clean electrical waveforms. ---