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AP440FX Motherboard Technical Product Specification
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
DOWN
DOWN
DOWN
DOWN
DOWN
UP
DOWN
UP
UP
DOWN
UP
DOWN
UP
UP
UP
UP
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.
36
Microprocessor
Clock Multiplier
DOWN
2.5
UP
2.5
DOWN
UP
DOWN
UP
DOWN
3
UP
3
Host Bus
Microprocessor
Freq.
Freq. (MHz)
(MHz)
150
60
166
66
reserved
reserved
reserved
reserved
180
60
200
66
PCI Bus
ISA Bus
Freq.
Freq.
(MHz)
(MHz)
30
7.5
33
8.33
30
7.5
33
8.33
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