3.
PCI-X Speed setting (3-pin PCIX_SPEED)
This jumper allows you to set the PCI-X slot's maximum frequency capability.
The jumper cap on pins 1-2: 133 MHz capability for the PCI-X slot.
The jumper cap on pins 2-3: 100 MHz capability for the PCI-X slot.
ASUS P5Q WS
2-21