Asus P55SP4 - Manual (Page 69)

P/I-P55SP4 User’s Manual
CPU Internal Clock External Mulitple Selector; JP20 & JP21
Use the 1.5 setting for 75MHz, 90Mhz and 1 OOMHz Pentium CPUs.
CPU Internal Clock JP20 JP21
Int. Clock = 1.5 X Ext. Clock Open Open 75/90/100
Int. Clock = 2 X Ext. Clock Open Short 120/133MHZ
Int. Clock = 2.5 x Ext. Clock Short Short 150/166MHZ
Int. Clock = 3 x Ext. Clock Short Open
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1.5xExtClk 2xExtClk 2.5xExtClk SxExtClk
Voltage Regulator Output Selector; JP22, JP23/JP28, JP29
Set these jumpers according to the voltage type of the installed CPU.
JP22 JP23. JP28 JP29
STD/VR Short Open Short Open
VRE Open Short Open Short
IMPORTANT: You must set these jumpers correctly for the CPU's voltage type or
your system will operate improperly. An incorrect setting can damage the CPU.
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