FSR 4.1 vs FSR 3 on Steam Machine: Performance and Image Quality

Valve's Steam Machine update puts FSR 4.1 on the device through Proton Experimental. AMD's developer documentation describes FSR 4.1.1 as an ML-powered upscaler optimized for RDNA 3 and RDNA 4. It can produce a cleaner moving image than FSR 3.1, but it also costs frames.

The decision is per game: use FSR 4.1 when its image-quality gain is worth the frame-rate cost, and stay on FSR 3.1 when performance headroom is tighter.

What changed and why it costs performance

The implementation details are more complicated than the old FP8-versus-INT8 shorthand suggests, and this article does not infer the exact execution path inside Steam Machine. The useful fact is simpler: AMD supports FSR 4.1.1 on RDNA 3, while Steam Machine's official route is through Proton Experimental. Independent RDNA 3 tests show that the newer upscaler can require more GPU time.

Two conditions before any of this applies:

• The game must already support FSR 3.1 or newer. Proton upgrades an existing implementation. It does not add upscaling to a game that lacks it.
• You need Proton Experimental selected for that game. See the Proton Experimental guide for how to switch and what else it changes.

What it costs, from independent testing

ComputerBase's RDNA 3 test compared FSR 4.1 with FSR 3.1 across nine games. Its reported cost by card was:

Steam Machine is not in that test. The RX 7600 is only a reference point because it is an RDNA 3 GPU with 8GB of VRAM; it is not a Steam Machine benchmark.

The spread between games matters more than a single average. ComputerBase reports substantially different costs by title, so use the table as a starting range rather than a promise for your library.

The 8GB problem

Steam Machine has 8GB of dedicated graphics memory, but we have not published a first-party memory-pressure test.

FSR 4.1 uses slightly more VRAM than FSR 3.1. ComputerBase's RX 7600 results show why an 8GB comparison needs caution: a memory limit behaves differently from a smooth percentage drop. Once you are VRAM-limited, you get texture pop-in, stutter, and frame pacing problems rather than a smooth lower framerate.

Steam Machine has the same 8GB buffer. Anything with an ultra or supreme texture preset at 1440p or 4K is where this shows up first.

If a game gets worse in a way that does not feel like "fewer frames" after you switch, VRAM is the first suspect, not the upscaler itself.

FSR 4.1 Performance versus FSR 3.1 Quality

Compare FSR 4.1 Performance with FSR 3.1 Quality rather than relying only on matching preset names.

TechSpot's comparison shows why matching a preset name is not the same as matching image quality. In some scenes, FSR 4.1 Performance can look competitive with or better than FSR 3.1 Quality while rendering more quickly, but that result is title-specific.

In a title where FSR 4.1 Performance matches FSR 3.1 Quality visually, the lower render preset may recover performance while retaining the motion-quality improvement.

If you were running FSR 3.1 Quality, try FSR 4.1 Performance and compare both image quality and frame time in the same scene. The result is title-specific.

Where the image quality actually improves

TechSpot's moving-image comparison highlights the same categories where temporal reconstruction matters most:

• Foliage, grass, and trees
• Water and transparent effects
• Fences and thin geometry
• Fire, holograms, and particles
• Disocclusion artifacts, the shimmering that appears behind moving objects

These are motion problems. A still screenshot understates the difference, which is why side-by-side stills are a bad way to evaluate this. If your games are heavy on any of the above, the upgrade is worth more than the average suggests.

When to use FSR 4.1

• The game is already hitting your target framerate and has headroom to spare.
• Image quality in motion is what is bothering you, especially foliage or particle shimmer.
• You can drop one preset tier, from Quality to Performance, to pay for it.
• The game is not close to the 8GB VRAM ceiling.

When to stay on FSR 3.1

• You are already below your target framerate. A roughly 7 to 14 percent cut in the independent RDNA 3 tests will not help.
• The game is texture-heavy at 4K and near the VRAM limit.
• Frame pacing matters more than resolve quality, which is most competitive multiplayer.
• The game is one of the outliers where the independent test cost runs materially higher than the typical range.
• You do not want to run Proton Experimental for that title. That is a legitimate reason on its own.

How to switch back

FSR 4.1 arrives through Proton Experimental, so returning to FSR 3.1 means returning to a Proton version without the upgrade path, or using a Proton build that does not apply it.

Do this per game rather than globally. The Proton Experimental guide covers the mechanics, including the prefix and save file caution that applies whenever you change Proton versions.

Steam Machine limits and recommendation

The Steam Machine path through Proton Experimental is confirmed in Valve's documentation, while AMD documents FSR 4.1.1 support for RDNA 3. The independent 7 to 14 percent test range came from other RDNA 3 systems, not Steam Machine. We have not published first-party Steam Machine frame-time or VRAM measurements, and the exact per-game cost remains unknown. Check the same scene after changing modes rather than treating that range as a guarantee.

Start with FSR 4.1 at one lower render preset, then check frame times for that title. If the game is already struggling or close to its memory limit, leave it on FSR 3.1 and spend the frames elsewhere.