What is the purpose of "SPD" in RAM modules?

The purpose of "SPD," or Serial Presence Detect, in RAM modules is to communicate RAM specifications to the operating system. SPD is a small chip located on the RAM module that contains crucial information about the memory's attributes. This includes details such as the module's size, speed, voltage requirements, and organization. When the computer powers on, the BIOS reads this information during the boot process to configure the RAM correctly for optimal performance and compatibility with the system.

This functionality is essential because it allows the operating system and the BIOS to automatically recognize the characteristics of the RAM installed in the system without requiring manual configuration by the user. By using SPD, the system can establish the most effective settings for the memory, ensuring proper operation and stability.