Definition: FSR4
AMD's newer ML upscaling generation, reachable in OptiScaler only on supported output/GPU/driver/game combinations.
Unsupported combinations fall back to another path, so verify the active mode instead of trusting the menu selection.
Where it matters
Start in the guides for the workflow, or go straight to Download and test one game at a time with a backup in place.
Frequently asked questions
What does FSR4 mean for OptiScaler?
AMD's newer ML upscaling generation, reachable in OptiScaler only on supported output/GPU/driver/game combinations. Unsupported combinations fall back to another path, so verify the active mode instead of trusting the menu selection.
Facts that do not change
- Version: OptiScaler 0.9.4 (reference build, July 2026)
- APIs: DirectX 11, DirectX 12, Vulkan
- Upscalers: DLSS, FSR and XeSS inputs/outputs where compatible
- Frame generation: Experimental OptiFG (DirectX 12)
- Overlay: Insert key
- Install: ZIP extracted next to the main game executable
- Platform: Windows; Linux via Proton/Wine varies
- Site: Independent guide — not the official project site
Practical Checklist
- Keep original files backed up before changing the game folder.
- Test one setting or backend at a time.
- Avoid anti-cheat protected online sessions.
- Document the working configuration before updating.
Independent guide: This site is not affiliated with OptiScaler or any other third-party platforms.
Related Guides
Continue with the related guides in the sidebar for setup, compatibility, performance, or safety topics.
- OptiScaler terms: OptiFG, proxy DLL, input and output — Short definitions: input upscaler, output upscaler, OptiFG, proxy DLL, Insert overlay, FSR4 and fallback paths.
- OptiScaler guides: install, FSR4, Linux, performance and safety — Step-by-step OptiScaler guides for installation, compatibility, performance, Linux, FSR4 and common user questions.
- Input upscaler — The upscaler a game already exposes — DLSS, FSR, XeSS or another supported temporal path.
- Output upscaler — The backend you select in the overlay to produce the final image.
- OptiFG — OptiScaler's experimental frame generation for some DirectX 12 scenarios.