Games that use Vulkan can now use FSR 4 upscaling thanks to the latest OptiScaler
PC Gamer
by Jacob Fox February 24, 2026
AI-Generated Deep Dive Summary
OptiScaler, a third-party tool, has outpaced AMD in enabling FSR 4 upscaling for Vulkan-based games. The latest update to OptiScaler’s test build introduces support for both Vulkan and DirectX 12, allowing users to upscale resolutions using FSR 4 and FSR 2.1 in games that officially lack this feature. This breakthrough is particularly significant for gamers using AMD hardware, as it provides a workaround for the limited official FSR 4 implementation by AMD. While AMD has gradually rolled out FSR 4 support, it has primarily focused on DX12-based titles, excluding Vulkan games until now.
Vulkan’s cross-platform compatibility makes it a popular choice among developers and gamers, especially in Linux ecosystems. However, OptiScaler doesn’t natively run on Linux; instead, users can leverage Proton and Mesa to make it work. This added functionality is crucial for fans of games like *Doom Eternal*, which rely heavily on Vulkan. The tool’s ability to process upscaling instructions via DirectX 12 bypasses the limitations of Vulkan itself, which doesn’t natively support FSR.
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Originally published on PC Gamer on 2/24/2026