Overclocking of Intel Core 2 Processors. Part II

3. Set frequencies of the PCI/PCIE buses manually. You must set the 33 MHz frequency for the PCI bus, and the value within 100-110 MHz – for PCI Express. In some motherboard models at the Auto value or rated 100 MHz value, the results may be worse than at the non-standard value of 101 MHz frequency.

4. Decrease the frequency of operating memory. You can do this in two ways depending on the motherboard model:

  • set a minimal frequency value of operating memory by using the “Memory Frequency” parameter or similar to it (you might turn off an automatic memory setting to access this parameter);
  • set a minimal multiplier value which defines the ratio between FSB frequency and memory by using the “FSB/Memory Ratio”, “System Memory Multiplier” parameters or similar to them.

As the methods of changing memory frequencies vary in different motherboards, it is recommended to reboot the computer and make sure that the memory frequency has really decreased with the help of diagnostic utilities EVEREST or CPU-Z.

5. After all preparations, you may start the procedure of overclocking. Firstly, you can increase the FSB frequency up to 20-25% (for example, from 200 to 250 MHz or from 266 to 320 MHz), then try to boot your system and check its operation. A setting parameter may be called CPU FSB Clock, CPU Overclock in MHz or in other way.


To access manual FSB adjustment, you might have to turn off an automatic setting of the processor frequency (the “CPU Host Clock Control” parameter) or dynamic overclocking of your motherboard. For example, you have to select Manual for the “Al Overclocking (Al Tuning)” parameter in motherboards by ASUS.

6. Check the real operating frequencies of your processor and memory by using the CPU-Z utility to make sure that your actions are correct. Necessarily monitor working temperatures and voltages. Run 1-2 test programs and make sure that there are not any delays and hangs.