Asus P/I-P55SP3AV - Manual (Page 64)

Technical Summary
CPU Internal Clock External Mulitple Selector: JP14& JP15
These set the factor by which the external bus clock is multiplied to establish the
internal CPU clock speed.
CPU Internal Clock JP14 JP15
Int. Clock = 1.5 X Ext. Clock Open Open 75/90/100
Int. Clock = 2 X Ext. Clock Short Open 120/133MHZ
Int. Clock = 2.5 X Ext. Clock Short Short 150/166MHZ
Int. Clock = 3 X Ext. Clock Open Short
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