Final answer:
The P1 connector for a motherboard is usually a 24-pin connector, which supplies power to the motherboard and is standard for ATX motherboards.
Step-by-step explanation:
The P1 connector that goes to the motherboard is typically a 24-pin connector. This connector is used to supply power to the motherboard and is part of the power supply unit (PSU) in a computer. The 24-pin P1 connector became the standard for ATX motherboards, and it includes an extra 4 pins compared to the older 20-pin version to provide additional power for the CPU and other motherboard components.