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Noisy Cpu Fan Hp Z 820

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Microsoft Windows 10 (64-bit)

Hello, i have a problem whit the fan from one of the processors. For 2 weeks it runs at a speed of 3640 rpm and has become noisy, the 2nd fan goes to 900 rpm and everything is ok just like the  rest of the hp z820 fans. I tried believing that everything that could be done, including from the bios, is idle. I ve changed the fans between them and the speed has now moved to the other fan and the first one has returned to normal 900 rpm, that means mechanically they re okay. I made an upgrade to win 10 but the problem started two weeks after those. Until then there was total silence i dit not hear him going, i pray long if you can help me whit a solution. Thanks 

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from within z820 Bios, what are cpu temp/fan speed after 3min?


if in bios both fan/cpu speeds are the same, problem is most likely within operating system


possible program running taking up all cpu time. to check boot windows use task manager to check cpu usage

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