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Pulsing noise from front fan 650D


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Plug the fan into a motherboard header and see if the fan pulses.

Is the fan connected to the 650D fan controller? Try switching it to max. and see if the fan still pulses.


If you have tried both suggestions and the fan still pulses, Request an RMA to replace the fan.

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the fan's connected to mobo header, it does it when connected to fan controller too.

the pulsing isn't constant every minute of every day, it's just often.


when i have the time, i'll swap it with the old roof fan, see if that does the same thing

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