ASRock Z790 Taichi Software/BIOS Setup Guide - Page 86
Chassis Fan 3 Control Mode, Chassis Fan 2 Step Down
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[PWM Mode] Select this mode for 4-pin fan. Chassis Fan 2 Setting Allows you to select a fan mode for Chassis Fan 2, or choose [Customize] to set 5 CPU temperatures and assign a respective fan speed for each temperature. Configuration options: [Customize] [Silent Mode] [Standard Mode] [Performance Mode] [Full Speed] Chassis Fan 2 Temp Source Allows you to select a fan temperature source for Chassis Fan 2. [Monitor M/B] Select this item to set motherboard as the fan temperature source. [Monitor CPU] Select this item to set CPU as the fan temperature source. Chassis Fan 2 Step Up Allows you to set the value of Chassis Fan 2 Step Up. Configuration options: [Level 0] - [Level 9] Chassis Fan 2 Step Down Allows you to set the value of Chassis Fan 2 Step Down. Configuration options: [Level 0] - [Level 9] Chassis Fan 3 Control Mode Allows you to select PWM mode or DC mode for Chassis Fan 3. [Auto] Select this mode to detect the type of installed fan and automatically switch the control modes. [DC Mode] Select this mode for 3-pin fan. [PWM Mode] Select this mode for 4-pin fan. Chassis Fan 3 Setting Allows you to select a fan mode for Chassis Fan 3, or choose [Customize] to set 5 CPU temperatures and assign a respective fan speed for each temperature. Configuration options: [Customize] [Silent Mode] [Standard Mode] [Performance Mode] [Full Speed] Chassis Fan 3 Temp Source Allows you to select a fan temperature source for Chassis Fan 3. 82