How to Change ACC on a Gigabyte Motherboard

Written by daniel foster
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How to Change ACC on a Gigabyte Motherboard
Overclock a processor to increase its clock speed. (cpu image by TEA from

Advanced Clock Calibration (ACC) is a feature on some Gigabyte motherboards with AMD Phenom processors that allow the user to override the CPU settings and increase the clock speed. Computer enthusiasts refer to this as "overclocking." The goal of an overclocker is to increase the processor speed to a level faster than the manufacturer intended and thus get a higher powered CPU for free. Changing the ACC settings on a motherboard is one way to overclock a CPU.

Skill level:


  1. 1

    Restart the computer. Press "Delete" on your keyboard when the start-up screen appears to enter the BIOS.

    How to Change ACC on a Gigabyte Motherboard
    Press "Delete" to enter the BIOS. (Keyboard with focus on "home" key image by Sophia Winters from
  2. 2

    Select the "MB Intelligent Tweaker (M.I.T.)" menu option. It is the first item in the BIOS. Use the arrow keys to navigate the menu and press "Enter" to make a selection.

    Select "Advanced Clock Calibration" and press "Enter." It is the first item on the menu.

  3. 3

    Change the Advanced Clock Calibration configuration. Use the arrow keys and "Enter" to select new settings. Choose "Disabled" to disable ACC or "Auto" to enable ACC and let the BIOS configure settings.

    Select "All Cores" or "Per Core" to manually configure the ACC settings on either all the processor cores at once or each core individually. Choose a value ranging from -12 per cent to +12 per cent for the cores. Positive values allow for more overclocking potential. Negative values allow the user to reduce the clock speed.

  4. 4

    Press "F10" to save the changes. If you want to revert to the default configuration, press "F7." Press "Escape" to leave the BIOS. The computer will boot up.

Tips and warnings

  • Only those experienced with overclocking should adjust the ACC settings.
  • Changing the ACC configuration could cause undesirable performance.

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