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 ...
Fan speed is temperature-controlled. The fan RPM range depends on what fan model you use. Fan control on the MSI B650M Mortar WIFI can be accessed in the BIOS or MSI User Scenario app (from MSI Center ...
CPU_FAN and CPU_OPT are entirely different and serve distinct purposes in the context of a computer cooling system. CPU_FAN or CPU Fan Header is the primary 4-pin fan header on a motherboard, and it ...
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