OptiScaler Setup for AMD and LinuxMight work on Windows

Red Dead Redemption 2555 views10 favorites2 min readby wade_cwnUpdated 18 JanView on Steam ↗

This is a simple step-by-step to getting OptiScaler working for RDR2 as of 1/3/26 using FSR 3.1.5 on a Linux PC.

Setup Derived from OptiScaler Wiki Compatibility for RDR2 [github.com]

Remove any existing OptiScaler, nvapi spoofs, asi loader and dll files.(Or just clean install)
Launch RDR2 and make sure you are on DX12 if you want the latest FSR. Vulkan also works just on FSR 3.1.4 instead of 5, also, it seems to be more stable and functional compared to DX12 from my testing.
Extract OptiScaler files to game directory.(I used v0.7.9 [github.com]) and install for Optiscaler.asi with nvidia inputs.
Download and extract fakenvapidll [github.com]to directory.
Create a plugins folder in game directory then download and extract OptiPatcherasi [github.com]to that plugins folder.
Download and extract dinput8dll [github.com]underneath Win64 to game directory.
- At this point this is what your directory should look like:

- You should have your OptiScaler files, fakenvapi files and dinput8.dll inside the main directory
where RDR2.exe is and a plugins folder which includes the OptiPatcher asi file.
If you are running DX12, in your OptiScaler.ini find OverlayMenu and change its value from auto to false. You don't have to do this if you are using Vulkan.

Then find LoadAsiPlugins and change its value to true.
Now add this command to your launch option for RDR2: WINEDLLOVERRIDES="OptiScaler.asi,dinput8.dll,OptiPatcher_v0.38.asi=n,b" %command%
If you are on Windows, you can skip this step!
Launch the game, check and see if dlss is available in settings. ENABLE DLSS (Ultra Quality, Balanced, etc.), DO NOT USE FSR! ALSO, DISABLE V-SYNC AND TRIPLE BUFFERING! If you are running Vulkan, you should be able to open up the GUI in menu, albeit its useless without being in-game. Start story mode and when you load in, OptiScaler should be working by pressing the Insert key and you should be able to change your upscaler.
- DX12 currently does not render the GUI fully so you have to change the OverlayMenu=false. This results in a faded GUI which looks like this but is still fully functional:

If done correctly you should see an (OP) at the top of the GUI, It should also say Spoof: Off
This is crucial, if you don't have an (OP) at the top of the GUI, you will come across lighting bugs and crashes in specific areas of the game. More on that is shown and discussed here. [github.com]
Note:
I didn't test this thoroughly meaning I didn't playthrough the game enough to see if its stable or not. I haven't been paying attention if OptiPatcher truly fixes this [github.com] or not. Testing and playing with OptiScaler/OptiPatcher would be much obliged. If you have any artifacts/bugs/crashes please open up a issue at OptiScaler [github.com] and OptiPatcher [github.com]