MSI MS-6161 User Manual page 8

2. The Jumper Switch J4 (1, 2, and 3) is used to set the CPU Bus frequency.
Note: You can set the CPU Bus Frequency through J4 or BIOS setting. If
you set this in the BIOS setting, the Jumper Switch J4 setting will
be void.
1 2
open open
open open
open short
short open
3 Bus Frequency
open 66MHz
short 68MHz
open 75MHz
short 83MHz
2-3