AMD’s FSR 4 upscaling technology has been a game-changer for performance in supported DirectX 12 titles, but Vulkan gamers have been left in the dust—until now. A pre-release test build of Optiscaler, a popular upscaling tool, has quietly added FSR 4 support for Vulkan-based games, bypassing AMD’s deliberate exclusion.
The update, spotted in a test version labeled 0.9.0-Pre10, enables FSR 4 for Vulkan titles by swapping in the newer upscaler where older FSR 3.1 was previously used. This means games like Doom: The Dark Ages and Indiana Jones and the Great Circle—both Vulkan-native—can now tap into FSR 4’s sharper, more efficient rendering, even if AMD’s official drivers still ignore them.
For context: AMD’s FSR 4 has been locked to RDNA 4 GPUs and DirectX 12 since launch, leaving Vulkan users and owners of older Radeon cards (RX 6000, RX 7000) out in the cold. The workaround relies on an INT8-optimized version of the upscaler, which some users had already manually enabled on non-RDNA 4 hardware. Now, Optiscaler automates the process—though it’s still a test build, meaning stability and edge cases may remain.
What’s Changing?
The key shift is Vulkan + FSR 4 compatibility, achieved through Optiscaler’s ability to inject FSR 4 into games that only supported FSR 3.1 before. This isn’t a driver update from AMD; it’s a community-driven patch that exposes functionality the company hasn’t prioritized. The catch? It requires manual setup and may not work flawlessly in all titles.
Key Technical Details
- FSR 4 Vulkan Support: Enables upscaling in Vulkan-native games (e.g., Doom: The Dark Ages, Indiana Jones and the Great Circle).
- Hardware Compatibility: Works on older GPUs like Radeon RX 6000 and RX 7000 series, provided the INT8 version of FSR 4 is installed.
- Performance Mode: FSR 4’s Performance preset reportedly outperforms FSR 3.1’s Quality mode in visual fidelity.
- Test Build Status: Version 0.9.0-Pre10 is the first to include this feature; stability is unconfirmed.
- AMD’s Stance: No official Vulkan support for FSR 4 has been announced, despite the upscaler being superior to FSR 3.1 in benchmarks.
The workaround hinges on two factors: Optiscaler’s ability to swap shaders and the presence of the INT8-optimized FSR 4 library. Users who’ve manually installed the INT8 version on older GPUs (like the RX 6000 or RX 7000) will find this test build particularly useful, as it automates the process. However, AMD’s lack of official Vulkan support suggests this may remain a niche solution—at least until the company catches up.
Who Should Care?
This fix is most relevant for
- Owners of Radeon RX 6000 or RX 7000 GPUs running Vulkan games who want access to FSR 4’s upscaling.
- Players of Vulkan-native titles that previously lacked FSR 4 support (e.g., Doom: The Dark Ages, Indiana Jones and the Great Circle).
- Tech-savvy users willing to test Optiscaler’s pre-release build for potential instability.
For most users, this remains a workaround rather than a permanent solution. AMD’s delay in expanding FSR 4 beyond DirectX 12 and RDNA 4 hardware is puzzling, especially since the upscaler’s performance mode already surpasses FSR 3.1’s quality settings. Whether this community effort spurs AMD to act—or simply becomes a temporary crutch—remains to be seen.
For now, the test build is the only way to unlock FSR 4 for Vulkan games. Installation requires downloading the pre-release from Optiscaler’s development channels and manually enabling the upscaler in supported titles. No official release date or AMD response has been confirmed.
