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16 ASUS TXP4 User’s Manual
III. INSTALLATION
(Jumpers)
III. INSTALLATION
3. CPU External (BUS) Frequency Selection (FS0, FS1, FS2)
These jumpers tell the clock generator what frequency to send to the CPU. These
allow the selection of the CPU’s External frequency (or BUS Clock). The BUS Clock
times the BUS Ratio equals the CPU's Internal frequency (the advertised CPU speed).
4. CPU to BUS Frequency Ratio (BF0, BF1, BF2)
These jumpers set the frequency ratio between the Internal frequency of the CPU
and the External frequency (called the BUS Clock) within the CPU. These must
be set together with the above jumpers CPU External (BUS) Frequency Selection.
R
CPU External Clock (BUS) Frequency Selection
CPU : BUS Frequency Ratio
3.0x(3/1)
3.0x(3/1)
----
----
3.0x(3/1)
2.5x(5/2)
2.5x(5/2)
1.0x(1/1)
2.0x(2/1)
2.5x(5/2)
2.0x(2/1)
2.0x(2/1)
2.0x(2/1)
2.0x(2/1)
2.0x(2/1)
1.5x(3/2)
3.5x(7/2)
3.0x(3/1)
3.0x(3/1)
3.5x(7/2)
CPU A
CPU B
CPU C
CPU D
CPU E
----
----
----
----
4.0X(4/1)
----
----
----
----
(4.5X)(9/2)
Match the table’s Ratio
column to these CPU types:
50MHz
1
2
3
FS2
FS1
FS0
55MHz
1
2
3
FS2
FS1
FS0
60MHz
1
2
3
FS2
FS1
FS0
66MHz
1
2
3
FS2
FS1
FS0
75MHz
1
2
3
FS2
FS1
FS0
83MHz
1
2
3
FS2
FS1
FS0
1
2
3
BF2
BF1
BF0
1
2
3
BF2
BF1
BF0
1
2
3
BF2
BF1
BF0
1
2
3
BF2
BF1
BF0
1
2
3
BF2
BF1
BF0
1
2
3
BF2
BF1
BF0
TXP4 CPU Settings
WARNING! Frequencies above 66MHz exceed the specifications for the
onboard Intel Chipset and are not guaranteed to be stable. The following
table is for general reference purposes only. Always refer to the instructions
included with your CPU when possible.