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 ...

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I'm planning on getting a Z77 motherboard when Ivy Bridge chips come out, so I'm currently planning my setup. I have a case with fans and water cooling waiting. I have 5 fans and 1 pump that all have ...