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16 ASUS P/I-P55T2P4S User’s Manual
III. INSTALLATION
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.
BF0
BF1
BF0
BF1
BF0
BF1
BF0
BF1
1
2
3
1
2
3
1
2
3
1
2
3
CPU : BUS Frequency Ratio
P54C/K5
P55C/K6/MX
IBM/Cyrix 6x86
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)
Complete Names:
Intel Pentium P54C/P55C-MMX, AMD K5/K6, IBM/Cyrix 6x86/6x86MX
CPU External Clock (BUS) Frequency Selection
50MHz
123
FS2
FS1
55MHz
123
FS2
FS1
FS2
FS1
66MHz
123
FS2
FS1
60MHz
123
FS2
FS1
75MHz
123
Set the jumpers by the Internal speed of your processor as follows:
(BUS Frequency) (Freq. Ratio)
CPU Model Freq. Ratio (BUS Freq.) FS2 FS1 BF0 BF1
Intel Pentium 233MHz 3.5x 66MHz [1-2] [2-3] [1-2] [1-2]
Intel Pentium 200MHz 3.0x 66MHz [1-2] [2-3] [1-2] [2-3]
Intel Pentium 166MHz 2.5x 66MHz [1-2] [2-3] [2-3] [2-3]
Intel Pentium 150MHz 2.5x 60MHz [2-3] [1-2] [2-3] [2-3]
Intel Pentium 150MHz 2.0x 75MHz [2-3] [1-2] [2-3] [1-2]
Intel Pentium 133MHz 2.0x 66MHz [1-2] [2-3] [2-3] [1-2]
Intel Pentium 120MHz 2.0x 60MHz [2-3] [1-2] [2-3] [1-2]
Intel Pentium 100MHz 1.5x 66MHz [1-2] [2-3] [1-2] [1-2]
Intel Pentium 90MHz 1.5x 60MHz [2-3] [1-2] [1-2] [1-2]
Intel Pentium 75MHz 1.5x 50MHz [2-3] [2-3] [1-2] [1-2]
AMD-K6-PR233 233MHz 3.5x 66MHz [1-2] [2-3] [1-2] [1-2]
AMD-K6-PR200 200MHz 3.0x 66MHz [1-2] [2-3] [1-2] [2-3]
AMD-K6-PR166 166MHz 2.5x 66MHz [1-2] [2-3] [2-3] [2-3]
AMD-K5-PR133/100 100MHz 1.5x 66MHz [1-2] [2-3] [1-2] [1-2]
AMD-K5-PR120/90 90MHz 1.5x 60MHz [2-3] [1-2] [1-2] [1-2]
AMD-K5-PR75 75MHz 1.5x 50MHz [2-3] [2-3] [1-2] [1-2]
IBM/Cyrix 6x86MX-PR233 200MHz 3.0x 66MHz [1-2] [2-3] [1-2] [2-3]
IBM/Cyrix 6x86MX-PR200 166MHz 2.5x 66MHz [1-2] [2-3] [2-3] [2-3]
IBM/Cyrix 6x86MX-PR166 150MHz 2.5x 60MHz [2-3] [1-2] [2-3] [2-3]
*IBM/Cyrix 6x86-PR166+ 133MHz 2.0x 66MHz [1-2] [2-3] [2-3] [1-2]
*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.
(Jumpers)
III. INSTALLATION