What does the mainboard power connector power on a motherboard?

The mainboard power connector, often referred to as the motherboard power connector or ATX power connector, is essential for supplying electrical power to various components of a computer system. When connected to a power supply, this connector provides power not just to the processor (CPU) but also to other key motherboard components, including the chipset, RAM, and integrated peripherals like USB ports and network interfaces.

When the power connector is engaged, it typically distributes power across multiple rails, which allows the motherboard to ensure that all vital functions are operational. This means that the CPU receives the necessary power for its operations, but other components like the RAM also require power during the boot process and operational phases. Additionally, onboard devices that may be integrated into the motherboard, such as the audio chipset or various controllers, also receive power through this connection.

The ability of the mainboard power connector to power everything except the CPU reflects a broader scope than just the CPU or specific components, highlighting its crucial role in energizing various elements of the computer system. Thus, the choice that states it powers everything except the CPU accurately encapsulates the function of the mainboard power connector.