What will happen when the supply and ground are connected for a CPU fan with PWM but the PWM wire is not connected? Will the fan run at its full speed?


closed as off-topic by brhans, RoyC, JRE, pipe, DoxyLover May 12 at 1:50

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You can connect a 4-pin fan (PWM controllable) to a 3-pin motherboard connector (non-PWM) without issue.

Most fans will simply run at full speed when the PWM pin floats.


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