Steam Machine · Guides
FSR 4.1 vs FSR 3 on Steam Machine: Performance and Image Quality
Summary
FSR 4.1 can improve moving image quality on Steam Machine, but independent RDNA 3 tests show a measurable cost. Use it per game and check the result against your frame-rate and memory headroom.
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.
Most coverage frames this as an upgrade you should take, or as a downgrade you should undo. Both framings miss the actual decision, which is per game and depends on what you are short of: frames or image quality.
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:
| GPU | FSR 4.1 cost vs FSR 3.1 |
|---|---|
| RX 7900 XTX at 4K | 11% Quality, 14% Performance |
| RX 7800 XT at 1440p | 7% Quality, 9% Performance |
| RX 7600 at 1080p | 7% Quality, 9% Performance |
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
This is the part Steam Machine owners should read twice. The 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.
The comparison almost everyone gets wrong
Comparing FSR 4.1 Quality against FSR 3.1 Quality is the wrong test.
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.
That inverts the usual tradeoff. Matching by preset name costs you frames. Matching by how the image actually looks can gain you both.
Practical version: if you were running FSR 3.1 Quality, try FSR 4.1 Performance rather than FSR 4.1 Quality. You will often land ahead on both counts.
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.
What we did not test
We have not published first-party Steam Machine frame-time or VRAM measurements for this comparison. The percentages above come from independent RDNA 3 testing, and Steam Machine is not one of those test systems. Check the game's own frame-time graph or an on-screen counter after changing the mode rather than treating the table as a guarantee.
What is confirmed and what remains unknown
Valve documents the Steam Machine path through Proton Experimental, and AMD documents FSR 4.1.1 support for RDNA 3. What remains unknown here is the exact per-game cost on Steam Machine and whether a particular title's texture settings will hit its 8GB graphics-memory limit.
The short version
FSR 4.1 is a real image quality improvement and a real performance cost. Independent RDNA 3 tests put the tested cost roughly in the 7 to 14 percent range, with higher outliers. Steam Machine-specific cost remains unknown, and the VRAM risk is not captured by that percentage.
The move worth trying first is FSR 4.1 with one lower render preset, then a title-specific frame-time check. If a game is already struggling or close to its memory limit, leave it on FSR 3.1 and spend the frames elsewhere.