Why kernel_task use 500-600% CPU

Hi. I have changed the display of iMac 27" EMC 2546 . Remove SSD because it was'n working. Inside present HDD 3Tb WD. I have reseted SMC, PRAM and reinstalled Mac OS. The fan RPM is 6600. I have installed Mac Fan Control. The kernel_task use 500-600% of cpu and I can't determine why. Do you have any ideas why kernel_task overload CPU?

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