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18 ASUS TX97-E User’s Manual
III. INSTALLATION
5. 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).
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.
R
CPU External Clock (BUS) Frequency Selection
FS2
FS1
FS0
123
75MHz
123
66MHz
123
60MHz
123
55MHz
50MHz
123
CPU : BUS Frequency Ratio
Complete Names:
Intel Pentium P54C, P55C-MMX
AMD K5, K6
Cyrix M1, M2
P54C/K5
P55C/K6/M2
Cyrix M1
123
3.0x(3/1)
3.0x(3/1)
4.0x(4/1)
123
2.5x(5/2)
2.5x(5/2)
1.0x(1/1)
123
2.0x(2/1)
2.0x(2/1)
2.0x(2/1)
BF1
BF0
123
1.5x(3/2)
3.5X(7/2)
3.0x(3/1)
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 BF0 BF1
Intel Pentium 200MHz 3.0x 66MHz [2-3] [2-3] [1-2] [1-2] [2-3]
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] [2-3] [1-2]
Intel Pentium 120MHz 2.0x 60MHz [2-3] [2-3] [2-3] [2-3] [1-2]
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-K6-PR233 233MHz 3.5x 66MHz [2-3] [2-3] [1-2] [1-2] [1-2]
AMD-K6-PR200 200MHz 3.0x 66MHz [2-3] [2-3] [1-2] [1-2] [2-3]
AMD-K6-PR166 166MHz 2.5x 66MHz [2-3] [2-3] [1-2] [2-3] [2-3]
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] [2-3] [1-2]
*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.
(Jumpers)
III. INSTALLATION