AMD’sFidelityFX Super Resolution 4 (FSR 4)upscaling is no longer limited to a short list of supported game titles. Thanks to a recent update to OptiScaler, Radeon RX 9000 series GPU users can now enable FSR 4 in virtuallyanygame that uses DirectX 11 or 12.
OptiScaleris an open-source utility that allows you to swap a game’s existing upscaler with a more advanced version. For instance, if a game supports an older upscaling method like FSR 2, OptiScaler can intercept that and substitute it with FSR 4 instead. This gives players access to the latest upscaling technology, even in games that haven’t officially been updated to support it.
Simply put, PC gamers can now bring FSR 4, AMD’s latest and most advanced image upscaling technology, to previously unsupported games. These include ones that originally shipped with FSR 2, DLSS 2, or Intel XeSS, with no input required from game developers.
While this isn’t an official method endorsed by AMD, OptiScaler only modifies local game installation files. Hence, there’s little risk involved as long as you stick to single-player titles and back up your game folders.
Requirements and limitations
Before we explain how to enable FSR 4 using OptiScaler, there are certain requirements you need to meet:
How to enable FSR 4 in your games
Force enabling FSR 4 via OptiScaler requires a few manual steps for each game. All you need to do is copy special FSR 4 library files into a game’s installation folder and configure OptiScaler to use it as the upscaler. While that may sound easy, it can be a little tricky so here’s a step-by-step guide:
Once you’ve followed the steps and replaced the necessary files, the game will render using FSR 4, which should deliver improved image quality and higher frame rates compared to older upscaling versions. However, don’t expect performance on par with Nvidia’s DLSS, which still holds a clear advantage in both visual fidelity and AI-driven upscaling.
While OptiScaler’s approach is somewhat of a workaround, it effectively extends FSR 4’s availability from a limited number of officially supported titles to potentially hundreds of DirectX 11 and 12 games.
That said, performance and visual improvements may vary from game to game depending on engine compatibility, asset quality, and how the original upscaling implementation was handled.
