How to Overclock a Radeon HD 4850


The ATI Radeon HD 4850 is a performance-oriented video card with the graphics processing unit running at 625MHz and 1GB of DDR3 video memory running at 990MHz. Radeon cards are noted for good overclocking performance. Overclocking is where you increase the speed of the GPU and memory for greater performance. It is mainly used by gamers who want to get every last frame per second out of their games. You can readily overclock the HD 4850 through the AMD Catalyst Control Center which comes installed with the HD 4850 drivers.

  • Right-click on a blank area on your desktop.

  • Click on "AMD Catalyst Control Center" in the menu that opens.

  • Click the "Performance" button. Click "AMD Overdrive." Click the "Lock" icon to unlock the overdrive function. Click the checkbox that says "Enable AMD Overdrive."

  • Click the "Auto-Tune" button. Click "Run." The Auto-Tune option will find the maximum stable GPU and memory settings. When it finishes, click "Done," then "Apply." You can also manually increase the GPU and Memory settings with the sliders labeled "High Performance GPU clock settings" and "High Performance Memory clock settings."

  • Click the "Test Custom Clocks" button after making adjustments. When testing is complete, click "Accept" to load the settings.

Tips & Warnings

  • You should download the latest driver package from AMD. The latest driver package comes with the "AMD VISION Engine Control Center," but it works the same way. If you use the manual option, increase the settings in small increments of 5-10MHz at a time. Your HD 4850 should be able to manage at least 680MHz for the GPU and 1030MHz on the memory.

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