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PCI-X Bus Speed Setting
Jumpers P1, P2, S1 and S2 are
used to change the speeds for the
four PCI-X buses. See the table on
the right for jumper settings.
PCI-X Buses:
S1: Bus for PCI-X slot #1 and SCSI
P1: Bus for PCI-X slots #2 and #3
S2: Bus for PCI-X slots #4 and #5
P2: Bus for PCI-X slot #6 and LAN2
Note: If two cards are used in slots
that share a bus, both slots will run
at 100 MHz (maximum).
33 MHz PCI Enable/Disable
If you wish to use 33 MHz PCI
cards, close J29 to force the P1
bus (slots 2 & 3) to run at 33 MHz.
See the table on the right for jumper
settings.
Note: if you force the slots(s) to 33
MHz, you must set the P1 bus
speed jumpers (above) to the low-
est speed.
PCI 3.3V Standby Enable/
Disable
JP2 is used to enable or disable a
3.3V standby voltage on pin A14
of the PCI-X slots. If you have a
LAN or modem add-on card in-
serted into a PCI-X slot that you
wish to "wake" the system up
with, you should enable this
jumper.
Otherwise, leave this
jumper on pins 1-2 (disabled).
The normal (default) position is
disabled.
See the table on the
right for jumper settings.
Chapter 5: Advanced Motherboard Setup
PCI-X Slot Bus Speed Settings
Pin
Setting
Pins 1-2
Pins 2-3
Pins 3-4
Pins 4-5
Default setting is PCI-X 100 MHz for all
slots.
Jumper
Position
Open
Closed
PCI 3.3V Standby Enable/
Disable Jumper Settings
Jumper
Position
Pins 1-2
Pins 2-3
5-23
Pin Definitions
(P1, P2, S1, S2)
Speed
PCI 33/66 M Hz
PCI-X 66 M Hz
PCI-X 100 M Hz
PCI-X 133 M Hz
33 MHz PCI
Enable/Disable
Jumper Settings
(J29)
Definition
Normal
33 MHz PCI
(JP2)
Definition
Disabled
Enabled
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