MSI G52-S9617X1 - Manual (Page 63)

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.