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supermicro server fan speed up and down

I have a SUPERMICRO 4U 24-BAY 846E1-R900B and the speed of the fans are up and down, Is not just a constant  speed, somebody know why?
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They are supposed to speed up when the temperature goes up and then slow down when the temp goes down to lower the noise level.  No reason to expect the speed to be constant.
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the fans goes up 3 seconds later goes down 3 seconds goes up and 3 seconds goes down, the temperature in the room is 68 F  and no dust in the the fans
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Monitor your CPU temperatures and see what they are.   Various utils exist like Speedfan  http://www.almico.com/speedfan.php to do this and see what the CPU temp is.  Is it higher than normal as Dr Klahn suggest or is it normal and there could another problem.
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the solution was changed the fan in the heatsink