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Iii. installation, 18 asus tx97-x user’s manual – Asus TX97-XE User Manual

Page 18

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18

ASUS TX97-X User’s Manual

III. INSTALLATION

(Jumpers)

III. INST

ALLA

TION

6. 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).

7. 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.

R

CPU External Clock (BUS) Frequency Selection

50MHz

FS1

1
2
3

FS0

FS2

55MHz

FS1

FS0

FS2

1
2
3

60MHz

FS1

FS0

FS2

1
2
3

66MHz

FS1

FS0

FS2

1
2
3

CPU : BUS Frequency Ratio

Complete Names:
Intel Pentium P54C, P55C-MMX
AMD K5, K6
Cyrix M1, M2

P54C/K5
P55C/K6/M2
Cyrix M1

3.0x(3/1)
3.0x(3/1)
4.0x(4/1)

2.5x(5/2)
2.5x(5/2)
1.0x(1/1)

2.0x(2/1)
2.0x(2/1)
2.0x(2/1)

1.5x(3/2)
3.5X(7/2)
3.0x(3/1)

BF1

BF0

1
2
3

BF1

BF0

1
2
3

BF1

BF0

1
2
3

BF1

1
2
3

BF0

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

(BUS Freq.)

(Freq. Ratio)

CPU Model

Freq.

Ratio

BUS Freq.

FS2

FS1

FS0

BF1

BF0

Intel Pentium

200MHz

3.0x

66MHz

[2-3] [1-2] [2-3]

[2-3] [1-2]

Intel Pentium

166MHz

2.5x

66MHz

[2-3] [1-2] [2-3]

[2-3] [2-3]

Intel Pentium

150MHz

2.5x

60MHz

[2-3] [2-3] [1-2]

[2-3] [2-3]

Intel Pentium

133MHz

2.0x

66MHz

[2-3] [1-2] [2-3]

[1-2] [2-3]

Intel Pentium

120MHz

2.0x

60MHz

[2-3] [2-3] [1-2]

[1-2] [2-3]

Intel Pentium

100MHz

1.5x

66MHz

[2-3] [1-2] [2-3]

[1-2] [1-2]

Intel Pentium

90MHz

1.5x

60MHz

[2-3] [2-3] [1-2]

[1-2] [1-2]

Intel Pentium

75MHz

1.5x

50MHz

[2-3] [2-3] [2-3]

[1-2] [1-2]

AMD-K6-PR233 233MHz

3.5x

66MHz

[2-3] [1-2] [2-3]

[1-2] [1-2]

AMD-K6-PR200 200MHz

3.0x

66MHz

[2-3] [2-3] [1-2]

[2-3] [1-2]

AMD-K6-PR166 166MHz

2.5x

66MHz

[2-3] [1-2] [2-3]

[2-3] [2-3]

AMD-K5-PR133 100MHz

1.5x

66MHz

[2-3] [1-2] [2-3]

[1-2] [1-2]

AMD-K5-PR120 90MHz

1.5x

60MHz

[2-3] [2-3] [1-2]

[1-2] [1-2]

AMD-K5-PR100 100MHz

1.5x

66MHz

[2-3] [1-2] [2-3]

[1-2] [1-2]

AMD-K5-PR90

90MHz

1.5x

60MHz

[2-3] [2-3] [1-2]

[1-2] [1-2]

AMD-K5-PR75

75MHz

1.5x

50MHz

[2-3] [2-3] [2-3]

[1-2] [1-2]

*Cyrix 166+

133MHz

2.0x

66MHz

[2-3] [1-2] [2-3]

[1-2] [2-3]

*NOTE:

Only Cyrix Rev 2.7 or later is supported on this motherboard. See next page for revision identifi-
cation. Bootup screen will show 6x86-P166+ with the Cyrix 166+ installed on this motherboard.