Nvidia 754 - Manual (Page 50)

BIOS
Page 4-20
4-8 POWER BIOS Features
This page lets you adjust various parameters to obtain improved performance for
overclocking.
Warning:
Overclocking requires expert knowledge and risks permanent damage to
system components. We recommend you leave these parameters at their
default values for proper operation.
Figure 9: Frequency/Voltage Control
CPU Frequency
Enables you to increment the CPU’s clock generator at 1 MHz step. This works
together with CPU Clock Ratio (below) to set the CPU operating frequency.
CPU Clock Generator x CPU Clock Ratio = CPU Frequency
For example, if you have a processor that is rated at 2.4GHz and the clock generator
is 200MHz, then 200MHz x 12 = 2.4GHz
Options: 200 to 400 in 1MHz increments.
    
Overclocking failure will cause no display on the monitor. To overcome this
switch off the power supply and switch on again. Restart the system, press and
hold <Insert> key. This will revert the BIOS to default or initial setting.