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10 ASUS P/I-XP55TVP4 User’s Manual
III. INSTALLATION
(Jumpers)
III. INSTALLATION
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.
1.5 (3/2)
123
BF1
BF0
2.0 (2/1)
123
2.5 (5/2)
123
3.0 (3/1)
123
BUS Frequency Ratio
1
2
3
50MHZ
FS1
1
2
3
FS0
FS2
60MHZ
FS1
1
2
3
FS0
FS2
55MHZ
FS1
FS0
FS2
66.6MHZ
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 BF0 BF1
Intel Pentium 200MHz 3.0x 66MHz [1-2] [2-3] [2-3] [1-2] [2-3]
Intel Pentium 166MHz 2.5x 66MHz [1-2] [2-3] [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 [1-2] [2-3] [2-3] [2-3] [1-2]
Intel Pentium 120MHz 2.0x 60MHz [2-3] [2-3] [1-2] [2-3] [1-2]
Intel Pentium 100MHz 1.5x 66MHz [1-2] [2-3] [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 PR133 100MHz 1.5x 66MHz [1-2] [2-3] [2-3] [1-2] [1-2]
AMD PR120 90MHz 1.5x 60MHz [2-3] [2-3] [1-2] [1-2] [1-2]
AMD PR100 100MHz 1.5x 66MHz [1-2] [2-3] [2-3] [1-2] [1-2]
AMD P90 90MHz 1.5x 60MHz [2-3] [2-3] [1-2] [1-2] [1-2]
AMD P75 75MHz 1.5x 50MHz [2-3] [2-3] [2-3] [1-2] [1-2]
*Cyrix 166+ 133MHz 2.0x 66MHz [1-2] [2-3] [2-3] [2-3] [1-2]
*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+ -S CPU at 133MHz with the Cyrix
166+ installed on this motherboard.