Aaeon PCM-7890 User Manual page 32

This jumper is reserved to connect a system temperature thermal
sensor in order to detect the system temperature.
CPU core frequency = CPU frequency ratio (3~5.5) * External
bus clock (66 or 100 MHz)
CPU frequency ratio (J3)
*default
20 PCM-7890 User Manual
3x
1 3 5
2 4 6
4.5x
1 3 5
2 4 6
3.5x
1 3 5
2 4 6
5x
1 3 5
2 4 6
4x
1 3 5
2 4 6
5.5x
1 3 5
2 4 6