How to enable FSR4 on RDNA3 cards for Darktide on Linux and Windows 11

Warhammer 40,000: Darktide Player Guides
1

Wanted to make a simple guide on how you can enable FSR4 even if you have an RDNA3 card. AMD is apparently making FSR4 available for RDNA3 cards later this year in July but for now I found this method to work really well.

FSR4 looks so much better than FSR3 and feels so much smoother for some reason. I went from 50-60fps on low settings on Windows 11 to 80-90fps on FSR4 Quality settings. I also tested it on Ubuntu 24.04 and gained some fps improvements as well.

I’ve added some links to try and keep the guide simple and easy to follow, and also to help with navigating GitHub. Make sure you take note of the versions of the tools used for the guide.

Technically you don’t need OptiScaler if you are on Windows 11, you just need the .dll files from the INT8 folder, but I included how to install it anyway if you want it.

Obviously only follow step 2a or 2b depending on whether you on Windows or Linux.

Step 1 - Download OptiScaler for Windows or Linux

  1. Search for the official OptiScaler page on GitHub
  2. Download OptiScaler_0.7.9.7z from the releases page (must be the Aug 25 2025 release)
  3. Extract the folder and copy all the files inside into your Darktide Binaries folder
  4. Rename OptiScaler.dll to dxgi.dll
  5. Open OptiScaler.ini and set Fsr4Update=true and ShortcutKey=0x24
  6. Only if on Linux, set the following launch commands for Darktide in Steam:
PROTON_FSR4_UPGRADE=1 DXIL_SPIRV_CONFIG=wmma_rdna3_workaround Fsr4Update=true WINEDLLOVERRIDES=dxgi=n,b %command%

Step 2a - Enable FSR4 with RDNA3 cards on Windows 11

1. Download the relevant files

  1. Search for the official AMD-FSR-4-INT8 page on GitHub
  2. Download FS4.Guide.zip from the release page (this guide uses the Sep 26 2025 release)
  3. Extract the folder, open the README.md file, and open the Google Drive link at the top
  4. Download the “SDK 2.0 + FSR4 INT8.rar” folder from that Google Drive page

2 Install the correct files to Darktide

  1. Extract the new “SDK 2.0 + FSR4 INT8.rar” folder
  2. Locate and copy the three .dll files inside into your Darktide binaries folder
  3. Locate the “FSR4 INT8” folder nested inside the “SDK 2.0 + FSR4 INT8.rar” folder
  4. Copy the single .dll file inside into your Darktide binaries folder

3. Launch Darktide and enable FSR4

  1. Launch Darktide and go to your in-game menu
  2. You should have FSR 4.0.2 available now

  1. Follow Step 3 to configure OptiScaler and confirm everything is working

Step 2b - Enable FSR4 with RDNA3 cards on Linux

1. Install compatible Proton versions

  1. Search for the official ProtonPlus page on GitHub
  2. Scroll down the page and click the Get it on FlatHub button
  3. Once installed, use it to download and install GE-Proton10-27
  4. Configure Darktide in Steam to use GE-Proton10-27

2. Install mesa 25.2.0 or newer

  1. Open your Linux terminal and type sudo apt install mesa-utils
  2. Once it is done, type glxinfo | grep "Mesa" to check your mesa version
  3. If it reports you have mesa 25.2.0 or newer, skip to step 3
  4. Otherwise, run the following to install the latest stable release of mesa:
sudo add-apt-repository ppa:kisak/kisak-mesa
sudo apt update
sudo apt upgrade
  1. Restart your computer once it is done and move on to Step 3

Step 3 - Configure OptiScaler

  1. Launch Darktide and enter the main lobby
  2. Open your in-game settings and enable FSR3 (or FSR4 if on Windows 11)
  3. Press the home key to open the OptiScaler menu
  4. Under the upscalers section, select FSR 3.X/4 and click the change upscaler button
  5. The dropdown under the FFX settings section should then default to FSR 4.0.2
  6. The top should read FSR 4.0.2 | Input: FFX-DX12 if everything is working correctly
  7. Optionally enable frame-gen in the game settings, not the OptiScaler menu

Red → mines shows FSR 4.0.2 | Input: FFX-DX12 which confirms my game is using FSR4
Orange → you need to set these options, and make sure you click the change upscaler button
Green → click the save ini button after making changes, or it will reset after the game is closed

Optional - Disable Control Flow Guard on Windows 11

Windows 11 has this thing called Control Flow Guard (CFG) built in to keep your computer memory secure. However it has been causing a lot of stuttering in many games for many players, especially in Darktide. If you feel okay with disabling it, then follow these steps:

  1. Go to Start and open the Windows Security app
  2. Click “App & Browser Control” on the left
  3. Click the “Explot protection settings” link under Exploit Protection
  4. Set Control flow guard (CFG) to “Off by default”, or disable it only for Darktide under programme settings
  5. Restart your computer to apply the changes
2

Thank you for your guide.

I own a RTX 5080 and I have been pushed by Microshit to Linux (they destroyed my OS without even a warning or a word)

I use Fedora 43 with KDE. So far, I am totally impressed by the OS. I think that I will remove Wincrap soon.
My tests with steam is 90% games work. I have 3 that need investigations… 2 of them I have solutions, I just need to read and apply the how to fix them.
The last is… Darktide. It launched, but I need to succeed to make Ray tracing and frame generation to work.
But at least, you confirm we can play…

Anyways, or I fix the situation, or I uninstall Darktide. No way I return under wincrap. If I cannot make Darktide working, well I will push the uninstall button.
Macroshit has really pushed too far with the 25H2… and what they plan after that is even worse.
And to be honest, I am really surprised by how Linux is really better. Valve did a great job, and MS is still 10 years late behind Linux in term of interface and customization for the OS.

3

Hey I just updated the guide as well. OptiScaler can be used for other features for RTX cards too but I don’t own a RTX cards so not familiar with it all

Yeah it was working really well but I was on Ubuntu 24.04. Have you tried to set Darktide to use Proton 8? I found that 9 didn’t work

4

There is a forum for Linux here: Linux Discussion - Fatshark Forums

I succeeded to play Darktide.
I play in 4k with all settings at max.

My only problem is about ray tracing. The game is unstable with ray tracing. It works, but sometimes the game crashes to desktop.
This is the only game that has a big problem with ray tracing. I play arc raiders with settings on epic and ray tracing at max and still see that the game could generates like 244 fps (as my monitor is a 144hz… sure I will never see such high frame rate).

At least it works…

5

I’m pretty sure you can still “see” 244fps on a 144fps monitor. You’ll just get a bit of screen tearing and stuff. You can enable vsync, freesync, or gsync if you want to lock your games to your monitors refresh rate if you want it to look smooth

6

By the way I think this solution broke frame gen on Windows. I play without it anyway but worth mentioning for anyone else thinking of trying this