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 ...
I've been installing a few case fans onto my new PC, and I had a fan that connected via the three pins on the motherboard. I've moved the three pin fan to a new location but I can't find any other ...
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