Hello Enzymnd,
generally if server is configured in AHCI mode then fan speed may change. i would suggest to check below
In the iLO web interface, navigate to the Information > System Information page.
Click the Fans tab.
Verify the fan status and fan speed.Fan speeds greater than 60% are expected to be loud.
If the fan is running at a higher speed than expected
if still issue is there then please logs a support case with HPE to check and assist further.
Regards