ASROCK PRO Series User Manual page 86

Chassis Fan 4 Setting
Select a fan mode for Chassis Fan 4, or choose Customize to set 5 CPU temperatures
and assign a respective fan speed for each temperature.
Chassis Fan 4 Temp Source
Select a fan temperature source for Chassis Fan 4.
Chassis Fan 4 Step Up
Set the value of Chassis Fan 4 Step Up.
Chassis Fan 4 Step Down
Set the value of Chassis Fan 4 Step Down.
Case Open Feature
Enable or disable Case Open Feature to detect whether the chassis cover has been
removed.
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