IIRC the extra pin on a 4 pin motherboard header may report if the fan has totally stopped, like a failure line, to tell the mobo to shut the CPU off. I've got an old 4 pin fan here from a '94 vintage ...

Trying to get AIO Fan speed back to MB (BIOS says no CPU fan reported, but it can be ignored). Temperatures are not an issue. The thing is, no included cable, and the connector on the Fan Controller ...

I'm Sayan Ghosh and I'm a contributor from Canada. I'd describe myself as an amateur photographer who loves storytelling and trying different street food. When not working, I'm on my custom-built PC, ...