FSR 4.1 Tested Against Redstone Stability and Clarity Analysis

Performance mode reveals reduced shimmering and improved reflections compared to FSR 4.0.3 Redstone implementation.

Hardware by Shinji Okazaki on Mar 04, 2026

A leaked DLL has revealed AMD FSR 4.1, which is comparable to FSR 4.0.3, commonly known as Redstone. The extracted file is said to originate from the future 26.3.1 drivers. It lets FSR4 be injected into games that support older FSR versions at the driver level. The driver can replace the in-game FSR versions with the latest model, just like Nvidia does with DLSS updates.

Right now, this approach lets RX 9000 series GPUs like the 9060 XT and 9070 XT use FSR4 injection. In the game, FSR 4.1 looks like version 4.1.0. You can install it by putting the file in the right folder and using driver injection or Optiscaler.

FSR 4.1 Tested, Against Redstone Stability and Clarity Analysis, NoobFeed

1440p Quality Mode Performance and Image Analysis

Testing starts with FSR 4.0.3 and FSR 4.1.0 in 1440p quality mode. The performance stays the same at 87 fps. In this setup, there are no noticeable FPS differences.

FSR 4.0.3 has increased noise around hair strands and edges, making image quality a little less clear. FSR 4.1 makes things sharper and more detailed, especially on clothing textures like shirts. But the differences in quality mode are small and need to be examined closely.

FSR 4.1 makes temporal stability better. The hair strands look more secure and less noisy. The variations in static images are small, though 4.1 shows clearer fine lines.

Differences in 1440p Performance Mode

There isn't much difference in FPS when you switch to 1440p performance mode. FSR 4.0.3 operates at 117 fps, whereas FSR 4.1 runs at 115 fps. The drop in performance is small.

In performance mode, image discrepancies are easier to see. FSR 4.0.3 has shimmering in the shadows and background. FSR 4.1 makes the shimmering less and the general stability better. In version 4.1, noise on surfaces like floors is much lower, especially when going from 720p to 1440p.

FSR 4.1 shows better temporal stability in reflections and objects that are far away. The variations in reconstruction quality are still slight, but the stability improvements are more obvious.

Testing Motion at 120 FPS

The motion analysis was filmed at 120 fps and then slowed down to 0.2 fps. FSR 4.0.3 shows more pixelation around character borders when running than FSR 4.1. With FSR 4.1, motion blur handling shows a small decrease in trailing artifacts.

In 1440p performance mode during Motion, hair strands look sharper with FSR 4.1, but they can also appear more pixelated than under 4.0.3. 4.1 looks sharper, but it might also make pixel edges show up in performance mode.

Testing Resident Evil Requiem at 1440p shows that FSR 4.1 improves the visuals. The lining and the jacket's roughness become clearer. Railings and slender structures show better temporal stability and less shimmering.

FPS stays about the same, at 110-111.

FSR 4.1 runs at 82 fps in cutscenes, while FSR 4.0.3 runs at 86 fps. In 4.1, facial details are sharper, and the shirt lining and lighting changes are clearer. The face looks more defined, and the lighting on the facial features appears a little different, which could indicate that the internal model needs to be updated.

Ray Tracing and Stability Over Time

Ray tracing high settings were tested, but ray reconstruction was not used. The denoiser in the game makes reflecting surfaces appear to shimmer.

FSR 4.0.3 makes shimmering very clear and unstable. FSR 4.1 makes these scenarios much more stable over time. There are still visual artifacts, but movement stability improves significantly.

The change is more obvious when you choose 1440p performance mode. FSR 4.0.3 makes reflections and noise that aren't steady; however, FSR 4.1 keeps the image stable. There is more ghosting in some wires and thin objects under 4.1, indicating a trade-off between ghosting and shimmering.

FSR 4.1 Tested, Against Redstone Stability and Clarity Analysis, NoobFeed

Testing for Expedition 33

Testing in Clair Obscur: Expedition 33 at 1440p. quality shows many particles in the scenes. Because the scenes are so complicated, ghosting is still noticeable in both versions.

FSR 4.1 makes the leaves look clearer. Compared to FSR 4.0.3, the leaves look clearer and less smudged. In quality mode, the differences in Motion ghosting are still minimal.

FSR 4.1 sometimes makes hair strands look pixelated in 1440p performance mode, while FSR 4.0.3 looks softer but more even. This indicates an oversharpening tendency in specific performance mode situations.

Final Thoughts

FSR 4.1 makes a noticeable difference in temporal stability, especially while ray tracing and on reflective surfaces. You can see increased clarity in the textures of clothes, leaves, and people's features. The effect on performance is still small, usually only a few fps, like 121fps vs. 118fps.

But there are trade-offs. When running at 1440p in performance mode, FSR 4.1 may cause oversharpening, pixelation in hair strands, and small ghosting artifacts that weren't there in FSR 4.0.3.

In most cases, FSR 4.1 works better than Redstone. In performance mode, stability advantages are more important than small performance issues. The upgrade doesn't make everything better in every test scenario. Still, it does make things clearer and makes the timing of events much more consistent across many titles.

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