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14 ASUS P2B User’s Manual
III. INSTALLATION
Jumpers
III. INSTALLATION
BF2
BF1
BF3
CPU Core:BUS Frequency Multiple
P2B CPU
R
BF0
BF2
BF1
BF3
BF0
BF2
BF1
BF3
BF0
BF2
BF1
BF3
BF0
BF2
BF1
BF3
BF0
BF2
BF1
BF3
BF0
BF2
BF1
BF3
BF0
2.0x (2/1)
2.5x (5/2) 3.0X (3/1) 3.5X (7/2) 4.0X (4/1) 4.5X (9/2) 5.0X (5/1)
FS1
FS2
FS0
1
2
3
FS1
FS2
FS0
1
2
3
FS1
FS2
FS0
1
2
3
2
1
3
2
1
3
2
1
3
2
1
3
2
1
3
2
1
3
FS1
FS2
FS0
1
2
3
FS1
FS2
FS0
1
2
3
FS1
FS2
FS0
103MHz
33.4MHz
CPU External Clock (BUS) Frequency Selection
CPU
PCI
66.8MHz
33.4MHz
75MHz
37.5MHz
83.3MHz
41.65MHz
100.2MHz
33.3MHz
112MHz
37.3MHz
BF2
BF1
BF3
BF0
BF2
BF1
BF3
BF0
BF2
BF1
BF3
BF0
BF2
BF1
BF3
BF0
BF2
BF1
BF3
BF0
BF2
BF1
BF3
BF0
5.5x (11/2)
6.0x (6/1) 6.5X (13/2) 7.0X (7/1) 7.5X (15/2) 8.0X (8/1)
2
1
3
2
1
3
2
1
3
2
1
3
2
1
3
1
2
3
FS1
FS2
FS0
133MHz
33.3MHz/
44.3MHz
3. CPU Bus Frequency (FS0, FS1, FS2)
This option tells the clock generator what frequency to send to the CPU, DRAM, and
440BX AGPset. This allows the selection of the CPU’s External frequency (or BUS
Clock). The BUS Clock multiplied by the BUS Ratio equals the CPU’s Internal fre-
quency (the advertised CPU speed).
4. CPU Core:BUS Frequency Multiple (BF0, BF1, BF2, BF3)
This option sets the frequency ratio between the Internal frequency of the CPU
and the CPU’s External frequency. These must be set in conjunction with the CPU
Bus Frequency.
WARNING! Frequencies above 100MHz exceed the specifications for the on-
board Intel Chipset and are not guaranteed to be stable.
NOTES: Overclocking your processor is not recommended. It may result in a slower
speed. Voltage Regulator Output Selection (VID) is not needed for the Pentium II
processor because it sends a VID signal directly to the onboard power controller.
Set the jumpers by the Internal speed of your processor as follows:
(BUS Freq.) (Freq. Ratio)
Intel CPU Model Freq. Ratio BUS F. FS0 FS1 FS2 BF0 BF1 BF2 BF3
Pentium II 450MHz 4.5x 100MHz [1-2] [1-2] [1-2] [1-2] [2-3] [1-2] [2-3]
Pentium II 400MHz 4.0x 100MHz [1-2] [1-2] [1-2] [2-3] [2-3] [1-2] [2-3]
Pentium II 350MHz 3.5x 100MHz [1-2] [1-2] [1-2] [1-2] [1-2] [2-3] [2-3]
Pentium II/Celeron 333MHz 5.0x 66MHz [1-2] [1-2] [2-3] [2-3] [1-2] [1-2] [2-3]
Pentium II/Celeron 300MHz 4.5x 66MHz [1-2] [1-2] [2-3] [1-2] [2-3] [1-2] [2-3]
Pentium II/Celeron 266MHz 4.0x 66MHz [1-2] [1-2] [2-3] [2-3] [2-3] [1-2] [2-3]