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10 ASUS P/I-AP55TV User’s Manual
III. INSTALLATION
6. CPU External (BUS) Frequency Selection (JP14, JP15, JP16)
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).
7. CPU to BUS Frequency Ratio (JP18, JP19)
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.
50MHz 55MHz 60MHz 66MHz
CPU External Clock (BUS) Frequency Selection
CPU : BUS Frequency Ratio (1.5x, 2.0x, 2.5x, 3.0x)
1.5 x
JP19
JP18
1
2
3
2.0 x 2.5 x 3.0 x
1
2
3
1
2
3
1
2
3
JP19
JP18
JP19
JP18
JP19
JP18
JP15
JP14
JP16
JP15
JP14
JP16
JP15
JP14
JP16
JP15
JP14
JP16
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. JP16 JP15 JP14 JP19 JP18
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 [1-2] [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 [1-2] [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 [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 100MHz 1.5x 66MHz [2-3] [2-3] [1-2] [1-2] [1-2]
AMD 90MHz 1.5x 60MHz [1-2] [2-3] [2-3] [1-2] [1-2]
AMD 75MHz 1.5x 50MHz [2-3] [2-3] [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 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.
(Jumpers)
III. INSTALLATION