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

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.
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
R
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
Freq.
Ratio
BUS Freq.
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.