Overclock LG 34UC88 to increase FreeSync range
At the beginning of Janaury i finally ascended and bought an LG 34UC88 Ultrawide 3440x1400. The 21:9 format is simply stunning for productivity, gaming and movies. It also supports AMD FreeSync technology that basically synchronise the panel's refresh rate to the frame rate computed by the GPU to get rid of stutters and tears (i won't go deep on this topic, feel free to Google it).
The default range for FreeSync on this panel is 55-75 Hz. It's quite narrow. In order to effectively use FreeSync your GPU have to produce between 55-75 FPS otherwise it will fall back to VSYNC on/off mechanism. However, you can overclock your monitor in order to achieve a wider frequency range so that even if your GPU produces less than 55 FPS you can still use FreeSync and avoid stutters and tears.
Note: Overclock is dangerous and can permanently damage your monitor.
The default range for FreeSync on this panel is 55-75 Hz. It's quite narrow. In order to effectively use FreeSync your GPU have to produce between 55-75 FPS otherwise it will fall back to VSYNC on/off mechanism. However, you can overclock your monitor in order to achieve a wider frequency range so that even if your GPU produces less than 55 FPS you can still use FreeSync and avoid stutters and tears.
Note: Overclock is dangerous and can permanently damage your monitor.
- Download the latest available version of CRU (Custom Resolution Utility)
- Extract the archive (.zip) in a folder of your choice and open CRU.exe
- In the dropdown list, select the monitor labeled as (active)*. Mine was detected as GMS76E4 - LG ULTRAWIDE (active)*
- Click on the Edit button on the right of the dropdown list
- By default you have, in Range limits, a V rate of 55 - 75 Hz. Just change 55 into 35.
- Press the ok on the bottom right of the main screen. The main program will close.
- To apply changes, go back to the folder you created at point 2 and execute restart.exe (x86 systems) or restart64.exe (x64 systems)
If you did everything correctly, you should see the change in the AMD Radeon Settings control panel (Display submenu).
As the image suggest, i was able to get a FreeSync range of 35-75 Hz which is much wider than the initial one. Please note that in the same way you can also get a wider range increasing the upper frequency (i.e. 75 Hz). It's not my case as i don't have a powerful GPU that can handle more than 60 FPS at 3440x1400.
To test if your panel can handle the new refresh rate, just play a game and check that image quality is great and flicker-free.
Enjoy.
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