Intel i915G User Manual page 53

Mainboard for intel socket 775 processor
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CPU CLOCK/SPEED
Enables you to increment the CPU's clock generator at 1MHz 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
Press <Enter> to display the following screen:
Key in the DEC (decimal) number for the CPU CLOCK/SPEED.
Note: 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.
Real Time Turbo Mode
This sets a value CPU CLOCK generator will jump to when the system is experiencing
a heavy load. Options available depend on system FSB.
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Memory Frequency
Enables you to select a ratio of the DDR DRAM to match the installed DRAM
frequency 333/400MHz. We recommend that you leave this item at the default value.
Options available depend on system FSB.
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Page 4-21

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