Foxconn P35A Series User Manual page 33

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.
Physical DRAM
FOX Ratio
CPU FSB
800MHz
1066MHz
1333MHz
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.
!
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.
DDR2 667MHz
1:1 1:1.25
400MHz 500MHz
533MHz 667MHz
667MHz 833MHz
1:1.66 1:1.2
667MHz 480MHz
888MHz 639MHz
1110MHz 800MHz
26
DDR2 800MHz
1:1.5 1:2
600MHz 800MHz
800MHz 1066MHz
999MHz 1333MHz