AMD FSR 4 Enabled On Radeon RX 6800 XT “RDNA 2” GPU, 10-20% Performance Hit But With Higher Image Quality

AMD's FSR 4 has reportedly been enabled on a Radeon RX 6800 XT GPU, which is based on the older RDNA 2 architecture.

AMD's FSR 4 Modded DLL Works With RDNA 2 GPUs Too? Reportedly Enabled On Radeon RX 6800 XT & Delivers Higher Image Quality

After the AMD FSR 4 source code leak a few days back, several users managed to enable the new tech on older and unsupported (officially) GPUs such as the Radeon RX 7000 from AMD themselves and NVIDIA's RTX 30 series. These leaked files were modded to support the INT8 version of FSR 4 instead of FP8. The 8-bit integer version was able to run on non-RX 9000 (RDNA 4) GPUs since these instructions are supported by many GPUs.

However, it looks like users are already enabling FSR 4 support on much older GPUs, such as the Radeon RX 6800 XT, which is based on the RDNA 2 architecture. One such user from Chiphell Forums managed to get AMD FSR 4 working on his Radeon RX 6800 XT. The title used for testing was Stellar Blade, which has FSR 3 support, but with OptiScaler, a custom modded DLL was used to enable FSR 4.0.2 in the game with "Model 3".

It is stated that the game achieved higher visual quality with FSR 4 versus FSR 3, but there was a hit in performance. With FSR 3 Quality mode, the game achieved over 110 FPS, but with FSR 4 Quality Mode, the game achieved around 100-107 FPS. The user states that he noticed a 10-20% drop in performance, which is significant, but in games that are running well over 100 FPS, you might as well have FSR 4 enabled, as it produces better upscaling quality than older FSR models.

Enabling FSR 4 yields a higher performance loss than FSR 3 on older GPUs since they aren't officially supported or have the proper hardware support. The Radeon RX 9000 GPUs themselves see a slight hit when enabling FSR 4 (2-4%) despite offering full support for FSR 4. The older RDNA 3 GPUs see around a 7%-10% performance hit, but RDNA 2 takes the biggest hit with the reported 10-20% figure.

This is due to many reasons, and one of them is the exclusion of WMMA (Wavefront Matrix Multiply Accumulation) instructions. This leads RDNA 2 GPUs to enable matrix operations through other hardware functions, such as DP4a or Integer units.

To get FSR 4 to work on RDNA 2 GPUs, follow these steps (via Reddit):

• Have the FSR SDK 2.0 downloaded
• Compile the INT8 FSR DLL
• Install 23.9.1 Driver for RDNA 2 GPUs (Newer versions don't work)
• Navigate through the FSR SDK 2.0 and copy the three .dll files
• Copy the compiled DLL files in the same folder, replace is required
• Start the game, enabling FSR should automatically make the game run FSR 4

Now, since the source code leak, there are many users who believe that AMD plans to release FSR 4 publicly to older GPUs, and if RDNA 2 is also on the list, then we can see much better support than the custom modded DLLs that are currently out in the open.

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