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AP440FX Motherboard Technical Product Specification
36
1.13.1 Microprocessor Configuration (J4L2)
These allow the motherboard to be switched between different speeds of the Pentium Pro
processor. These jumpers also affect the PCI and ISA clock speeds as shown in Table 23.
Table 23. Microprocessor/System Speed Settings
J4L2-A J4L2-B J4L2-C
Microprocessor
Clock Multiplier
Microprocessor
Freq. (MHz)
Host Bus
Freq.
(MHz)
PCI Bus
Freq.
(MHz)
ISA Bus
Freq.
(MHz)
DOWN DOWN DOWN 2.5 150 60 30 7.5
DOWN DOWN UP 2.5 166 66 33 8.33
DOWN UP DOWN reserved
DOWN UP UP reserved
UP DOWN DOWN reserved
UP DOWN UP reserved
UP UP DOWN 3 180 60 30 7.5
UP UP UP 3 200 66 33 8.33
1.13.2 Motherboard Configuration (J4L2, J1J1)
The jumpers for sections D, E, F, G, and H of J4L2 allow the selection of various motherboard
features. A second jumper block (J1J1) allows selection of a riser board with either two or three
PCI board connectors. A third jumper (J8A2) is used to provide 3.5 V for processors that require
that voltage.
CAUTION
Do not install a jumper on the J8A2 header if you are using a processor that does not require
3.5V. The increased voltage could damage the processor.