IBM Aptiva 2159, Manual

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System Bus Clock
The System bus clock jumpers are set to the Type and Model of the Aptiva
computer. Other jumper settings are not supported and might cause system
failures.
Figure 5-2. System Bus Clock
Core Bus Frequency Ratio Settings
The Core bus frequency ratio jumpers are set to the Type and Model of the
Aptiva computer. Other jumper settings are not supported and might cause
system failures.
Figure 5-3. Core Bus Frequency Ratio Settings
Function Jumper 66.6 MHz 60 MHz 50 MHz
System Bus Clock JP2 1-3, 2-4 3-5, 4-6 3-5, 2-4
Function Jumper 3:2 2:1 2.5:1 3:1
Core/Bus
Frequency
Ratio
JP3 1-3, 2-4 3-5, 2-4 3-5, 4-6 1-3, 4-6
5-4