Asus TX97-X User Manual - Page 18

ASUS TX97-X User's Manual, CPU External BUS Frequency Selection, FS0, FS1, FS2, CPU to BUS Frequency

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R III. INSTALLATION (Jumpers) III. INSTALLATION 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. FS0 FS1 FS2 FS0 FS1 FS2 FS0 FS1 FS2 FS0 FS1 FS2 1 1 1 1 2 2 2 2 3 3 3 3 50MHz 55MHz 60MHz 66MHz CPU External Clock (BUS) Frequency Selection BF0 BF1 BF0 BF1 BF0 BF1 BF0 BF1 Intel P54C Intel P55C Cyrix M1 1 1 1 1 2 2 2 2 3 3 3 3 1.5 x 3.5 x 3.0 x 2.0 x 2.0 x 2.0 x 3.0 x 3.0 x 3.0 x 2.5 x 2.5 x 2.0 x CPU : BUS Frequency Ratio Set the jumpers by the Internal speed of the Intel, AMD, or Cyrix CPU as follows: CPU Model Intel Pentium Intel Pentium Intel Pentium Intel Pentium Intel Pentium Intel Pentium Intel Pentium Intel Pentium Freq. 200MHz 166MHz 150MHz 133MHz 120MHz 100MHz 90MHz 75MHz Ratio 3.0x 2.5x 2.5x 2.0x 2.0x 1.5x 1.5x 1.5x AMD-K5-PR133 100MHz 1.5x AMD-K5-PR120 90MHz 1.5x AMD-K5-PR100 100MHz 1.5x AMD-K5-PR90 90MHz 1.5x AMD-K5-PR75 75MHz 1.5x *Cyrix 166+ 133MHz 2.0x BUS Freq. 66MHz 66MHz 60MHz 66MHz 60MHz 66MHz 60MHz 50MHz 66MHz 60MHz 66MHz 60MHz 50MHz 66MHz (BUS Freq.) FS2 FS1 FS0 [2-3] [2-3] [1-2] [2-3] [2-3] [1-2] [2-3] [2-3] [2-3] [2-3] [2-3] [1-2] [2-3] [2-3] [2-3] [2-3] [2-3] [1-2] [2-3] [2-3] [2-3] [2-3] [1-2] [2-3] [2-3] [2-3] [1-2] [2-3] [2-3] [2-3] [2-3] [2-3] [1-2] [2-3] [2-3] [2-3] [2-3] [1-2] [2-3] [2-3] [2-3] [1-2] (Freq. Ratio) BF1 BF0 [2-3] [1-2] [2-3] [2-3] [2-3] [2-3] [1-2] [2-3] [1-2] [2-3] [1-2] [1-2] [1-2] [1-2] [1-2] [1-2] [1-2] [1-2] [1-2] [1-2] [1-2] [1-2] [1-2] [1-2] [1-2] [1-2] [1-2] [2-3] *NOTE: Only Cyrix Revision 2.7 or later is supported on this motherboard. See next page for revision identification. Bootup screen will show 6x86-P166+ with the Cyrix 166+ installed on this motherboard. 18 ASUS TX97-X User's Manual

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18
ASUS TX97-X User’s Manual
III. INSTALLATION
(Jumpers)
III.
INSTALLATION
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.
CPU : BUS Frequency Ratio
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
BF1
BF0
1
2
3
BF1
BF0
1
2
3
BF1
BF0
1
2
3
BF1
1
2
3
BF0
2.5 x
3.0 x
2.0 x
3.5 x
2.5 x
3.0 x
2.0 x
1.5 x
2.0 x
3.0 x
2.0 x
3.0 x
Intel P54C
Intel P55C
Cyrix M1
Set the jumpers by the Internal speed of the Intel, AMD, or Cyrix CPU as follows:
(BUS Freq.)
(Freq. Ratio)
CPU Model
Fr
eq.
Ratio
BUS Fr
eq.
FS2
FS1
FS0
BF1
BF0
Intel Pentium
200MHz
3.0x
66MHz
[2-3]
[2-3]
[1-2]
[2-3]
[1-2]
Intel Pentium
166MHz
2.5x
66MHz
[2-3]
[2-3]
[1-2]
[2-3]
[2-3]
Intel Pentium
150MHz
2.5x
60MHz
[2-3]
[2-3]
[2-3]
[2-3]
[2-3]
Intel Pentium
133MHz
2.0x
66MHz
[2-3]
[2-3]
[1-2]
[1-2]
[2-3]
Intel Pentium
120MHz
2.0x
60MHz
[2-3]
[2-3]
[2-3]
[1-2]
[2-3]
Intel Pentium
100MHz
1.5x
66MHz
[2-3]
[2-3]
[1-2]
[1-2]
[1-2]
Intel Pentium
90MHz
1.5x
60MHz
[2-3]
[2-3]
[2-3]
[1-2]
[1-2]
Intel Pentium
75MHz
1.5x
50MHz
[2-3]
[1-2]
[2-3]
[1-2]
[1-2]
AMD-K5-PR133
100MHz
1.5x
66MHz
[2-3]
[2-3]
[1-2]
[1-2]
[1-2]
AMD-K5-PR120
90MHz
1.5x
60MHz
[2-3]
[2-3]
[2-3]
[1-2]
[1-2]
AMD-K5-PR100
100MHz
1.5x
66MHz
[2-3]
[2-3]
[1-2]
[1-2]
[1-2]
AMD-K5-PR90
90MHz
1.5x
60MHz
[2-3]
[2-3]
[2-3]
[1-2]
[1-2]
AMD-K5-PR75
75MHz
1.5x
50MHz
[2-3]
[1-2]
[2-3]
[1-2]
[1-2]
*Cyrix 166+
133MHz
2.0x
66MHz
[2-3]
[2-3]
[1-2]
[1-2]
[2-3]
*NOTE:
Only Cyrix Revision 2.7 or later is supported on this motherboard.
See next page for revision
identification.
Bootup screen will show
6x86-P166+
with the Cyrix 166+ installed on this
motherboard.