Asus P5NT WS - Manual (Page 45)

ASUS P5NT WS 2-21
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P5NT WS PCI-X Speed setting
PCIX_SPEED
AUTO by PCI-X Card
(Default)
Force PCI-X 133MHz Force PCI-X 100MHz
1 1 1
2. PCI-X Speed setting (6-pin PCIX_SPEED)
This jumper allows you to set the PCI-X slot’s maximum frequency
capability.
1~2: the slots will have 133 MHZ capability whether you install one or two
cards.
3~4: the slots will have 100 MHZ capability whether you install one or two
cards.