AMD/ATI Pixel Clock Patcher is a modification to the AMD/ATI video driver that removes the 165 MHz pixel clock limit for single-link DVI and HDMI, the 330 MHz limit for dual-link DVI, and the 400 MHz limit for VGA. Simply put, it enables you to adjust the graphics driver settings for AMD/ATI graphical processing units to achieve higher refresh rates and enhance resolutions on your machines.

Portable
AMD/ATI Pixel Clock Patcher is portable and works on systems equipped with an AMD/ATI 5000-series GPU or newer. The presence of the driver file is automatically detected, and the application fails to load if the driver is not present.

This download contains an executable file that requires administrator privileges to be launched. Depending on your specific requirements, you can rename this executable file to modify particular options and settings.

Getting started:

Run atikmdag-patcher.exe. (If you only need the BIOS signature patch, rename it to atikmdag-patcher-bios.exe first.)

If all limits are found, click "Yes" to patch and sign. If a limit is not found or if multiple matches are found, the patcher needs to be updated.

Reboot.

You can then add higher refresh rates using Custom Resolution Utility (CRU).

To restore the unpatched driver, run the patcher again and click "Yes" to restore from the backup.

Unpatching is not required before upgrading drivers. Simply run the patcher again after installing the new driver.

Available Rename Options

atikmdag-patcher-bios.exe - Patch BIOS signature check only.

atikmdag-patcher-sl.exe - Make dual-link DVI ports act as single-link DVI. Use this to surpass the 230 MHz pixel clock with single-link DVI monitors.

atikmdag-patcher-dl.exe - Do not patch single-link DVI limit on dual-link DVI ports. Useful for 2560x1080 monitors.

atikmdag-patcher-self.exe - Use self-signed certificate. Windows test mode is required: (https://www.monitortests.com/testmode.zip)

Scanning Process
After launching the AMD/ATI Pixel Clock Patcher, you will need to wait for the scanning process to be completed. Once all the limits are detected, you can proceed by pressing a button and allowing the patches to be applied.

Compatibility

AMD/ATI Pixel Clock Patcher version 1.4.15 is compatible with Catalyst 11.9 to Adrenalin 24.7.1 for Polaris/Vega (not RDNA). If it detects the limits you need, it can also be used with future versions.

Riot Vanguard and FACEIT Anti-Cheat will not allow patched drivers to load.

Known Issues:

Legacy drivers may have issues with HDCP and video acceleration with the patch. Workarounds for video playback issues:
-Disable hardware acceleration in the Flash Player settings (right-click on any Flash video and click "Settings...").
-Use the Codec Tweak Tool to disable DXVA hardware acceleration under "Various Tweaks" (in the "Miscellaneous" section).

Older cards require the "LCD standard" vertical blanking/total to reduce the memory clock when idle. Horizontal values can still be reduced if necessary. Newer cards can handle some lower values depending on the resolution and refresh rate.

Older cards have a design limitation unrelated to the patch that causes video acceleration to scramble the screen if the vertical blanking/total is below standard with the video card's memory overclocked or with multiple monitors connected. Skype is known to trigger this problem. Either don't overclock the video card's memory, or use the "LCD standard" vertical blanking/total in CRU.

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