The **UG9KG-AL6-R** is a specific part number typically associated with high-performance memory modules, specifically **DDR4 SDRAM Unbuffered DIMM (UDIMM)**. This part is often manufactured by specialized memory solution providers like *Unigen*. Below is a detailed breakdown of its specifications and electronic characteristics. ### Technical Specifications | Parameter | Specification | | :--- | :--- | | **Memory Type** | DDR4 SDRAM | | **Form Factor** | 288-pin UDIMM | | **Capacity** | 8GB (Commonly) | | **Speed Grade** | PC4-2400 (2400 MT/s) | | **Voltage** | 1.2V (Standard DDR4 Low Power) | | **CAS Latency** | CL17 | | **Error Correction** | Non-ECC | | **Rank** | Single Rank (1Rx8) | --- ### Key Electronic Components #### 1. DRAM Integrated Circuits (ICs) The core of the module consists of individual DRAM chips. In a 1Rx8 configuration, there are typically 8 chips soldered onto the PCB. These chips utilize **Differential Signaling** for data strobes to reduce noise and improve timing accuracy at high frequencies. #### 2. Serial Presence Detect (SPD) EEPROM This is a small 2Kb or 4Kb non-volatile memory chip located on the module. - **Function:** It stores the module's timing parameters, manufacturer ID, and voltage requirements. - **Communication:** The system BIOS/UEFI reads this chip via the **I2C/SMBus interface** during the Power-On Self-Test (POST) to automatically configure the memory controller. #### 3. Decoupling Capacitors (MLCCs) You will notice numerous tiny ceramic capacitors near the gold fingers and the DRAM chips. - **Purpose:** They filter high-frequency noise and provide local energy storage to handle sudden current spikes when the memory cells are refreshed or accessed. #### 4. Register/Buffer (Not present on this model) As a **UDIMM (Unbuffered)**, this part lacks a register chip. The address and control signals go directly from the CPU's memory controller to the DRAM chips, which reduces latency but limits the total number of modules the system can support compared to RDIMMs. --- ### Environmental and Compliance Features * **RoHS Compliant:** The "-R" suffix usually denotes compliance with "Restriction of Hazardous Substances" (Lead-free). * **Gold-Plated Contacts:** The 288 pins are plated with gold to prevent oxidation and ensure a low-resistance electrical connection with the motherboard slot. * **Operating Temperature:** Typically rated for commercial range (0°C to +85°C).