ASUS p-i-p55t2p4s Manuel D’Utilisation

ASUS P/I-P55T2P4S User’s Manual

III. INSTALLATION

5. CPU External (BUS) Frequency Selection (FS1, FS2)

These jumpers tells 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 ad-
vertised CPU speed).

6. CPU to BUS Frequency Ratio (BF0, BF1)

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.

CPU : BUS Frequency Ratio (1.5x, 2.0x, 2.5x, 3.0x)

1.5 x

1
2
3

BF0

BF1

2.0 x

1
2
3

BF0

BF1

2.5 x

1
2
3

BF0

BF1

3.0 x

1
2
3

BF0

BF1

CPU External Clock (BUS) Frequency Selection

50MHz

1 2 3

FS2
FS1

55MHz

1 2 3

FS2
FS1

66MHz

1 2 3

FS2
FS1

60MHz

1 2 3

Set the jumpers by the Internal speed of the Intel, Cyrix, or AMD CPU as follows:

(BUS Frequency)

(Freq. Ratio)

CPU Model

Freq.

Ratio

(BUS Freq.)

FS2

FS1

BF0

BF1

Intel Pentium

200MHz

3.0x

66MHz

[1-2] [2-3]

Intel Pentium

166MHz

2.5x

66MHz

[1-2] [2-3]

[2-3] [2-3]

Intel Pentium

150MHz

2.5x

60MHz

[2-3] [1-2]

[2-3] [2-3]

Intel Pentium

133MHz

2.0x

66MHz

[1-2] [2-3]

[2-3] [1-2]

Intel Pentium

120MHz

2.0x

60MHz

[2-3] [1-2]

Intel Pentium

100MHz

1.5x

66MHz

[1-2] [2-3]

[1-2] [1-2]

Intel Pentium

90MHz

1.5x

60MHz

[2-3] [1-2]

[1-2] [1-2]

Intel Pentium

75MHz

1.5x

50MHz

[2-3] [2-3]

[1-2] [1-2]

Cyrix 166+

133MHz

2.0x

66MHz

[1-2] [2-3]

[2-3] [1-2]

AMD

100MHz

1.5x

66MHz

[1-2] [2-3]

[1-2] [1-2]

AMD

90MHz

1.5x

60MHz

[2-3] [1-2]

[1-2] [1-2]

AMD

75MHz

1.5x

50MHz

[2-3] [2-3]

[1 -2] [1-2]

(Jumpers)

III. INST

ALLA

TION