Was it really compatible with the MOBO?
I'd suggest doing a Prime95 test to check for issues: https://www.tenforums.com/tutorials/16474-prime95-stress-test-your-cpu.html
NOTE: If the device overheats during the stress test, immediately stop the stressing to avoid hardware damage.
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If the proc is fully compatible with the MOBO, please try to set your power mode to Performance mode, as users here reported that it worked for them: https://www.sysnative.com/forums/threads/0x124-caused-by-genuineintel-workarounds-dont-let-cpu-mhz-drop-disable-intelppm-disable-speedstep-change-power-plan-settings-remove-under-clock.32907/
Also update your Windows.