Motherboard Fan Headers Explained (CPU, SYS, CHA, AUX)
A motherboard fan header is a 3-pin or 4-pin connector on a motherboard that delivers 12V power and speed-control signals to PC cooling fans while receiving RPM feedback. Last updated: July 2026 Quick Answer: What Is a Motherboard Fan Header? A fan header on a motherboard is a small cluster of pins that powers cooling…