AMD Says FSR 4 Support is Limited to RDNA 4 GPUs Despite INT8 Leak

In Focus

• AMD developed FSR 4 on the RDNA 4 architecture
• An INT8 version of FSR 4 accidentally on AMD’s GPUOpen platform
• The leak suggested FSR 4 might work on older GPUs

U.S. chipmaker AMD launched FidelityFX Super Resolution 4 (FSR 4) in 2025. At the time, FSR 4 was a major improvement for Radeon graphics cards and worked well in most games. For the first time, AMD’s quality was comparable to NVIDIA’s DLSS.

But the AMD FSR 4 update has a major drawback, it does not support the entire set of AMD graphics. Instead, it only works on RDNA 4 GPUs. According to TechPowerUp, AMD is still not clear whether FSR 4 will run on Radeon RX 7000 GPU series or on older ones.

No New FSR 4 Updates

Currently, AMD says it does not have new updates to share about FSR 4 largely due to hardware differences. The company designed FSR 4 on the RDNA 4 architecture, which supports a feature known as 8-bit floating point (FP8) instructions.

Previous architectures like RDNA 2 and RDNA 3 do not work with FP8 instructions, which means they cannot run FSR 4 the same way. Older Radeon GPUs are capable of using a different method called INT8 (8-bit integer) processing. This method is fully supported by the RX 7000 series of GPUs.

Recently, AMD accidentally leaked an INT8 version of FSR 4 on its GPUOpen platform. Although the chipmaker is yet to announce this officially, the leak suggested that FSR 4 might work on older GPUs.

AMD’s Instinct GPUs have been used to train FSR upscaling, which runs best on RDNA 4 graphics cards. AMD stock plunged 15% last week after the company announced its fourth-quarter results.

Radeon Improvements in Linux Kernel

AMD’s FSR 4 shows how much performance and image quality depend on software. However, critical Radeon improvements are now happening at the kernel level in Linux. Released on February 8, 2026, Linux kernel 6.19 Radeon introduces an important change to older AMD GPUs.

By default, the update activates the AMDGPU kernel driver in some older Radeon HD graphics cards. These cards previously relied on the older Radeon DRM driver, which has been the default for over two decades.

AMD commented on the FSR 4 update issue weeks after unveiling its upcoming AI data center platform, Helios Rack. The system matches AMD’s MI455X chips against NVIDIA’s Rubin GPUs.

What Would a Shift to AMDGPU Mean?

For Linux users, shifting to the AMDGPU driver works well because it’s recent, better maintained, and fully optimized. Early testing shows multiple real-world benefits. For instance, the performance of Radeon HD 7950 improved by around 30% from using the newer driver.

This performance reflects a significant improvement for hardware that’s over a decade old.
Linux 6.19 also includes a DRM Color Pipeline API update that boosts gaming graphics display. The new API allows HDR and color processing to be handled by dedicated hardware, instead of GPU shaders.

Although the update is not available on all Linux gaming AMD graphics cards yet, it’s an important step toward more efficient and accurate color and HDR handling on Linux systems.