Asus P/I-P55T2P4S User Manual page 16

5. CPU External (BUS) Frequency Selection (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.
Complete Names:
Set the jumpers by the Internal speed of your processor as follows:
CPU Model
Intel Pentium
Intel Pentium
Intel Pentium
Intel Pentium
Intel Pentium
Intel Pentium
Intel Pentium
Intel Pentium
Intel Pentium
Intel Pentium
AMD-K6-PR233
AMD-K6-PR200
AMD-K6-PR166
AMD-K5-PR133/100
AMD-K5-PR120/90
AMD-K5-PR75
IBM/Cyrix 6x86MX-PR233
IBM/Cyrix 6x86MX-PR200
IBM/Cyrix 6x86MX-PR166
*IBM/Cyrix 6x86-PR166+
*NOTE: Only IBM or Cyrix Revision 2.7 or later is supported on this motherboard (see next page).
Bootup screen will show 6x86-P166+ with the Cyrix PR166+ installed on this motherboard.
16
III. INSTALLATION
1 2 3
FS2 FS2
FS1 FS1
50MHz 55MHz
CPU External Clock (BUS) Frequency Selection
1.5x(3/2)
P54C/K5
3.5X(7/2)
P55C/K6/MX
3.0x(3/1)
IBM/Cyrix 6x86
CPU : BUS Frequency Ratio
Intel Pentium P54C/P55C-MMX, AMD K5/K6, IBM/Cyrix 6x86/6x86MX
Freq. Ratio
233MHz 3.5x
200MHz 3.0x
166MHz 2.5x
150MHz 2.5x
150MHz 2.0x
133MHz 2.0x
120MHz 2.0x
100MHz 1.5x
90MHz 1.5x
75MHz 1.5x
233MHz 3.5x
200MHz 3.0x
166MHz 2.5x
100MHz 1.5x
90MHz 1.5x
75MHz 1.5x
200MHz 3.0x
166MHz 2.5x
150MHz 2.5x
133MHz 2.0x
ASUS P/I-P55T2P4S User's Manual
1 2 3 1 2 3 1 2 3
FS2 FS2
FS1 FS1
60MHz 66MHz
1
1 1
2
2 2
3
3
3
2.0x(2/1) 2.5x(5/2)
2.0x(2/1)
2.5x(5/2)
2.0x(2/1)
1.0x(1/1)
(BUS Frequency)
(BUS Freq.) FS2 FS1
66MHz [1-2] [2-3]
66MHz [1-2] [2-3]
66MHz [1-2] [2-3]
60MHz [2-3] [1-2]
75MHz [2-3] [1-2]
66MHz [1-2] [2-3]
60MHz [2-3] [1-2]
66MHz [1-2] [2-3]
60MHz [2-3] [1-2]
50MHz [2-3] [2-3]
66MHz [1-2] [2-3]
66MHz [1-2] [2-3]
66MHz [1-2] [2-3]
66MHz [1-2] [2-3]
60MHz [2-3] [1-2]
50MHz [2-3] [2-3]
66MHz [1-2] [2-3]
66MHz [1-2] [2-3]
60MHz [2-3] [1-2]
66MHz [1-2] [2-3]
1 2 3
FS2
FS1
75MHz
1
2
3
3.0x(3/1)
3.0x(3/1)
4.0x(4/1)
(Freq. Ratio)
BF0 BF1
[1-2] [1-2]
[1-2] [2-3]
[2-3] [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] [2-3]
[2-3] [2-3]
[1-2] [1-2]
[1-2] [1-2]
[1-2] [1-2]
[1-2] [2-3]
[2-3] [2-3]
[2-3] [2-3]
[2-3] [1-2]