Asus P2B-B User Manual page 16

4. CPU External (BUS) Frequency Selection (FS0, FS1, FS2, FS3)
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).
5. CPU to BUS Frequency Ratio (BF0, BF1, BF2, BF3)
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.
P2B-B CPU Settings
WARNING! Frequencies above 100MHz exceed the specifications for the on-
board Intel Chipset and are not guaranteed to be stable.
WARNING! PCI frequencies above 33MHz exceed the specifications for PCI
cards and are not guaranteed to be stable.
Set the jumpers by the Internal speed of your processor as follows:
Intel CPU Model
Pentium II 450MHz 4.5x 100MHz [1-2] [1-2] [1-2] [2-3] [1-2] [2-3] [1-2] [2-3]
Pentium II 400MHz 4.0x 100MHz [1-2] [1-2] [1-2] [2-3] [2-3] [2-3] [1-2] [2-3]
Pentium II 350MHz 3.5x 100MHz [1-2] [1-2] [1-2] [2-3] [1-2] [1-2] [2-3] [2-3]
Pentium II/Celeron 366MHz 5.5x 66MHz [1-2] [1-2] [2-3] [2-3] [1-2] [1-2] [1-2] [2-3]
Pentium II/Celeron 333MHz 5.0x 66MHz [1-2] [1-2] [2-3] [2-3] [2-3] [1-2] [1-2] [2-3]
Pentium II/Celeron 300MHz 4.5x 66MHz [1-2] [1-2] [2-3] [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] [2-3] [1-2] [2-3]
Pentium II/Celeron 233MHz 3.5x 66MHz [1-2] [1-2] [2-3] [2-3] [1-2] [1-2] [2-3] [2-3]
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/Celeron
processor because it sends a VID signal directly to the onboard power controller.
16
III. INSTALLATION
1 2 3 1 2 3
BF0
BF1
BF2
BF3
2.0x(2/1) 2.5x(75/2)
CPU Core:Bus Frequency Multiple
1 1
2 2
3 3
CPU 66.8MHz CPU
PCI 33.4MHz PCI
1 1
2 2
3 3
CPU 105.0MHz CPU
PCI 35.0MHz PCI
1 1
2 2
3 3
CPU 124.0MHz CPU
PCI 31.0MHz PCI
CPU Bus Frequency
Freq. Ratio BUS F. FS0 FS1 FS2 FS3
ASUS P2B-B User's Manual
1 2 3 1 2 3 1 2 3 1 2 3
4.0x(4/1)
3.0x(3/1) 3.5x(7/2) 4.5x(9/2)
1 1
2 2
3 3
75.0MHz CPU 83.0MHz CPU 100.3MHz
37.5MHz PCI 41.6MHz PCI 33.4MHz
1 1
2 2
3 3
110.0MHz CPU 112.0MHz CPU 115.0MHz
36.7MHz PCI 37.3MHz PCI 38.3MHz
1 1
2 2
3 3
133.0MHz CPU 133.0MHz CPU 140.0MHz
44.3MHz PCI 33.3MHz PCI 35.0MHz
(CPU BUS Freq.) (Freq. Multiple)
BF0 BF1 BF2 BF3
1 2 3 1 2 3
5.0x(5/1) 5.5x(11/2)
1
2
3
CPU 103MHz
PCI 34.3MHz
1
2
3
CPU 120.0MHz
PCI 40.0MHz
1
2
3
CPU 150.0MHz
PCI 37.5MHz