How to Overclock a Radeon HD 3870

Written by wayne howard
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How to Overclock a Radeon HD 3870
Make your ATI Radeon HD even faster by overclocking it. (Computer trip image by Andrzej Malek from

The ATI Radeon HD 3870 is a powerful graphics card that is capable of high-definition quality graphics and 1080P playback on Blu-ray discs. Even with such a graphics card, its performance can still be improved by overclocking it. Most graphics cards come installed with their settings underclocked to avoid overheating and using too many resources. ATI has added a tool to its Catalyst Control Center that will allow you to overclock the card.

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Things you need

  • ATI Catalyst Control Center

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  1. 1

    Launch the ATI Catalyst Control Center by right-clicking on your desktop and choosing "Catalyst Control Center." If you do not see it, you can install it from the AMD downloads page.

  2. 2

    Choose "ATI Overdrive" from the "Graphics" toolbar menu.

  3. 3

    Click "Enable ATI Overdrive" and then choose "Auto-Tune." This will automatically optimise your card for you by running a series of tests.

    Alternatively, you can manually do this by adjusting the "GPU clock settings" and Memory clock settings" sliders. Make small incremental changes, then press "Test Custom Clocks" until the test fails. This means you have set it to the optimal settings.

Tips and warnings

  • Damage caused from overclocking is not covered under your warranty.

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