ASUS VX97 User’s Manual
15
III. INSTALLATION
(Jumpers)
III. INST
ALLA
TION
4. 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).
5. 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.
Complete Names:
Intel Pentium P54C, P55C-MMX
AMD K5, K6
IBM/Cyrix 6x86, 6x86MX
CPU : BUS Frequency Ratio
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
BF1
BF0
BF1
BF0
BF1
BF0
P54C/K5
P55C/K6/MX
IBM/Cyrix 6x86
CPU External Clock (BUS) Frequency Selection
75MHz
FS1
1
2
3
FS0
FS2
66MHz
FS1
1
2
3
FS0
FS2
60MHz
FS1
1
2
3
FS0
FS2
55MHz
FS1
1
2
3
FS0
FS2
50MHz
FS1
1
2
3
FS0
FS2
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
233MHz
3.5x
66MHz
[2-3] [1-2] [2-3]
[1-2] [1-2]
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] [1-2] [2-3]
[2-3] [1-2]
AMD-K6-PR166
166MHz
2.5x
66MHz
[2-3] [1-2] [2-3]
[2-3] [2-3]
AMD-K5-PR133/100
100MHz
1.5x
66MHz
[2-3] [1-2] [2-3]
[1-2] [1-2]
AMD-K5-PR120/90
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]
IBM/Cyrix 6x86MX-PR233
200MHz
3.0x
66MHz
[2-3] [1-2] [2-3]
[2-3] [1-2]
IBM/Cyrix 6x86MX-PR200 166MHz
2.5x
66MHz
[2-3] [1-2] [2-3]
[2-3] [2-3]
IBM/Cyrix 6x86MX-PR166 150MHz
2.5x
60MHz
[2-3] [2-3] [1-2]
[2-3] [2-3]
*Cyrix 166+
133MHz
2.0x
66MHz
[2-3] [1-2] [2-3]
[1-2] [2-3]
*NOTE: Only Cyrix Revision 2.7 or later is supported on this motherboard. Bootup screen will show
6x86-P166+ with the Cyrix 166+ installed on this motherboard.