Asus Z97-K R2.0 User Manual page 75

Chassis Fan 1/2 Min. Duty Cycle(%) [60]
Use the <+> or <‑> keys to adjust the minimum chassis fan duty cycle. The values
range from 60% to 100%. When the CPU temperature is under the lower limit, the
chassis fan operates at the minimum duty cycle.
2.7.6 Anti Surge Support [Enabled]
This item allows you to enable or disable the Anti Surge function. Configuration options:
[Disabled] [Enabled]
ASUS Z97-K R2.0 2‑43