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Foxconn P35A User Manual

Page 33

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An Overclocking System :

A CPU FSB 800MHz system with a DDR2 667MHz memory installed, from the below table you
can see, its Ratio number is set to 1:1.66 by the system. Now, we want to overclock it.

Overclocking Example 1 :
1. Select [667 MHz] at DRAM Frequency setting.
2. Select [1:1.66] at FOX Ratio Select setting.

Now, CPU FSB Type is displaying 800MHz, and Memory Target Frequency is displaying
667MHz.

3. At the setting of CPU FSB Over Clock Choice, input a new CPU FSB number, e.g., [1066

MHz].
You can read the display of Memory Target Frequency is [888MHz].

4. Press [ESC] to exit Overclock Options page, then go to Main Menu, select "Save Changes

and Exit", system will power down to change the settings and reboot again.

5. After new boot, your system will be running at 1066MHz CPU speed (physically 800MHz)

together with an 888MHz memory speed (physically 667MHz).

Overclocking Example 2 :
1. Select [667 MHz] at DRAM Frequency setting.
2. Select [1:1.25] at FOX Ratio Select setting.

Now, CPU FSB Type is displaying 800MHz, and Memory Target Frequency is displaying
500MHz. We can say at this moment, the memory (physically 800MHz) is underclocked.

3. At CPU FSB Over Clock Choice setting, try increasing the CPU Speed by pressing [+], you

can see each time when CPU Speed is increased, the Memory Target Frequency is also
increased. Try increasing CPU Speed to [1066 MHz].
You can read Memory Target Frequency is [800MHz] now. This is an example telling that
only CPU is overclocked, while memory is operating in its normal state.

4. Press [ESC] to exit Overclock Options page, then go to Main Menu, select "Save Changes

and Exit", system will power down to change the settings and reboot again.

Physical DRAM

DDR2 667MHz

DDR2 800MHz

FOX Ratio

CPU FSB

1:1

1:1.25

1:1.66

1:1.2

1:1.5

1:2

800MHz

400MHz

500MHz

667MHz 480MHz

600MHz

800MHz

1066MHz

533MHz

667MHz

888MHz 639MHz

800MHz

1066MHz

1333MHz

667MHz

833MHz

1110MHz 800MHz

999MHz

1333MHz

All the changed settings of overclocking must be saved before exiting BIOS, then it
will function. PC will hardware shut down with total power off, it does not like software
shut down of which the power is still on.

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