Micro Star Computer MS- 9130 v1.x - Manual (Page 59)

3-23
BIOS Setup
CPU Fan1/CPU Fan2/SYS Fan Tolerance Value
You can select a fan tolerance value here for the specific range for the “Smart
CPU Fan1/CPU Fan2/SYS Fan Temperature” items. If the current temperatures
of the 3 fans reach to the maximum threshold (the temperatures set in the
“Smart CPU Fan1/CPU Fan2/SYS Fan Temperature” plus the tolerance values
you set here), the fans will speed up for cooling down. On the contrary if the
current temperatures reach to the minimum threshold (the set temperatures
minus the tolerance values), the fans will slow down to keep the temperatures
stable.