Asus P I-P55TVP4 User Manual Page 16

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ASUS P/I-P55T2P4 User's Manual10
III. INSTALLATION
(Jumpers)
III. INSTALLATION
7. CPU External (BUS) Frequency Selection (JP8, JP9, JP10)
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).
8. CPU to BUS Frequency Ratio (JP11, JP12)
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.
CPU External Clock (BUS) Frequency Selection
50MHz 55MHz 60MHz
1
2
3
1
2
3
1
2
3
JP9
JP8
JP10
JP9
JP8
JP10
JP9
JP8
JP10
66MHz
1
2
3
JP9
JP8
JP10
75MHz
1
2
3
JP9
JP8
JP10
Complete Names:
Intel Pentium P54C, P55C-MMX
AMD K5, K6
IBM/Cyrix 6x86, 6x86MX
1
2
3
JP12
JP11
1
2
3
JP12
JP11
1
2
3
JP12
JP11
1
2
3
JP12
JP11
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)
Set the jumpers by the Internal speed of the Intel, AMD, IBM, or Cyrix CPU as follows:
(BUS Freq.) (Freq. Ratio)
CPU Model Freq. Ratio B. Freq. JP10 JP9 JP8 JP12 JP11
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 [1-2] [2-3] [2-3] [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 [1-2] [2-3] [2-3] [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 [1-2] [2-3] [2-3] [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 [1-2] [2-3] [2-3] [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 [1-2] [2-3] [2-3] [2-3] [2-3]
*IBM/Cyrix6x86-PR166+ 133MHz 2.0x 66MHz [2-3] [1-2] [2-3] [1-2] [2-3]
*NOTE: Only IBM or Cyrix Rev 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.
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