Chapter 4 Configuring the Motherboard
14
TI6NB Pentium II 440BX ATX Motherboard User’s Manual
4.1 CPU Frequency Select: S1(1-8)
Refer to the following table for the correct setting to match the CPU
frequency.
CPU
Type
CPU
Frequency
S1(1-8)
3.5 x 66MHz
233MHz
off off off off on off off on
4 x 66MHz
266MHz
off off off off off on on on
Klamath
66MHz
Host Clock
CPU
4.5 x 66MHz
300MHz
off off off off off on off on
Deschutes
66MHz
Host Clock
CPU
5x 66MHz
333MHz
off off off off off off on on
3 x 100MHz
300MHz
off off off off on off on on
3.5 x 100MHz
350MHz
off off off off on off off on
4 x 100MHz
400MHz
off off off off off on on on
Deschutes
100MHz
Host Clock
CPU
4.5 x 100MHz
450MHz
off off off off off on off on
NOTE: Switches S1(2), S1(3) and S1(4) should be left to its default
setting of OFF. Do not reset these switches. For ‘engineering sample’
CPU, S1(1) can be used to set the CPU bus speed. For 66MHz, set this
switch to ON; for 100MHz, this switch is OFF. For ‘mass produced’
CPU, S1(3) should be set to OFF for auto-detection of the CPU bus
speed.
