Cpu Clock Frequency Selector: Jp7 - Acorp 4845PE Manual

Chapter 1

1.7.16 CPU Clock Frequency Selector: Jp7

Overclocking is to operate a CPU with a frequency which surpass
the default CPU clock. Jp7 jumper is designed to offer a chance
for CPU overclocking.when starting system.
If a 100MHz CPU is used on board, setting Jp7 to 1-2 closed or
2-3 closed will not offer a chance of overclocking from 100MHz
to 133MHz. Only if Jp7 is set at all pins open, there will be a
chance of starting the system with 133MHz.
NOTE:
1. Intel usually provides CPUs with locked CPU frequency so as to
forbid CPU overclock. We therefore don't recommend users to do
CPU overclocking on Intel CPU because you may risk CPU damage.
2. However, if you are going to do overclocking, please make sure
your CPU multiplier is unlocked.
Jp7 Setting
CPU(MHz)
1
1
1-2 closed 2-3 closed
Auto-detect 100 MHz
(default)
Socket 478
Intel
845PE
1-25
Motherboard 4845PE
1
Open
133 MHz
Intel
ICH4