An RGB hub is a small splitter placed inside a computer case that serves to centralize and manage the color lighting of multiple components. Computer motherboards typically have a limited number of connectors for attaching RGB elements, such as fans, CPU coolers, or LED strips. If the number of these lighting components exceeds the number of available headers on the board, an RGB hub addresses this shortage. It works by connecting to a single RGB header on the motherboard and providing several additional outputs where individual components are then plugged in. This allows for synchronous control of all connected devices using the motherboard manufacturer’s software, as if they were a single device. To ensure sufficient power for all lights, it often requires its own connection to the computer's power supply, typically via a SATA connector. It is necessary to distinguish between standard "RGB" (4-pin connector), where all LEDs display the same color, and addressable "ARGB" (3-pin connector), which allows each LED to be controlled individually to create advanced effects, such as a rainbow. The hub, the connected components, and the motherboard header must always be of the same type to ensure correct functionality.
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