Early tests comparing Windows 11 and SteamOS on Valve’s Steam Machine show a more complicated picture than a simple win for either operating system. Windows 11 posted a substantial advantage in one synthetic multi-core CPU benchmark and small gains in several 4K gaming tests, while SteamOS matched or exceeded Windows in some 1080p and 1440p game results. The most useful conclusion is that gaming performance was generally close in the limited titles tested, but the CPU benchmark gap and differences in testing conditions mean the results should not be treated as a definitive measurement of operating-system efficiency.
What the Windows 11 and SteamOS Benchmarks Show
The comparison used the same Steam Machine hardware with Windows 11 and SteamOS and examined both synthetic CPU performance and several games. In Geekbench 6, Windows 11 scored about 3.3% higher in the single-core test and approximately 22.1% higher in the multi-core test. That multi-core difference is large enough that it should not simply be described as measurement noise.
Gaming produced a considerably different pattern. Shadow of the Tomb Raider, Cyberpunk 2077, and Horizon Zero Dawn Remastered generally remained within a few frames per second of each other across the two operating systems, although individual results changed with game and resolution.
| Test area | Observed result | What it suggests |
|---|---|---|
| Geekbench 6 single-core | Windows 11 about 3.3% ahead | Relatively modest difference |
| Geekbench 6 multi-core | Windows 11 about 22.1% ahead | Large difference, but testing mode matters |
| 1080p and 1440p gaming | Results frequently within a few FPS | No consistent large advantage across the tested games |
| 4K gaming | Windows 11 led the three reported comparisons | Small advantage in this particular test set |
Why the Geekbench CPU Results Look Very Different
The roughly 22% multi-core difference is one of the most striking numbers in the comparison. Windows 11 recorded approximately 9,750 points while SteamOS produced roughly 7,986 points in Geekbench 6 multi-core testing. A difference of that size is meaningful within the benchmark itself.
However, there is an important qualification. The SteamOS Geekbench run was performed from desktop mode, which can use different CPU power and frequency behavior from SteamOS gaming mode. That makes the result useful as an observation of the tested configuration rather than proof that Windows intrinsically provides 22% greater CPU performance on identical workloads under every condition.
Large benchmark differences should be interpreted alongside power profiles, CPU frequency behavior, operating mode, background processes, and benchmark methodology rather than attributed automatically to the operating system alone.
Gaming Performance Was Much Closer
The CPU benchmark advantage did not translate into a similar advantage in gaming. Across the reported game tests, Windows and SteamOS frequently differed by only a few frames per second. Some tests favored Windows while others favored SteamOS.
Shadow of the Tomb Raider, for example, ran at approximately 118 FPS on SteamOS and 120 FPS on Windows at 1080p. At 1440p the direction reversed, with SteamOS around 86 FPS and Windows around 84 FPS. Differences of this size are unlikely to represent the kind of dramatic performance shift suggested by the Geekbench multi-core result.
This also illustrates why CPU benchmark scores cannot be converted directly into expected gaming frame rates. Modern games can become limited by the GPU, memory bandwidth, graphics settings, driver behavior, or particular sections of the game engine long before additional CPU throughput becomes useful.
Cyberpunk 2077 Shows Why Resolution Matters
Cyberpunk 2077 produced one of the more interesting reversals. At native 1080p using the tested Ultra settings, SteamOS produced roughly 74 FPS compared with about 68 FPS on Windows 11. That represents an advantage of roughly 9% for SteamOS in that particular test.
At 1440p the difference became smaller, with approximately 45 FPS on SteamOS and 43 FPS on Windows. At 4K, however, Windows reached about 20 FPS while SteamOS reached approximately 18 FPS.
| Cyberpunk 2077 resolution | SteamOS | Windows 11 | Observed leader |
|---|---|---|---|
| 1080p Ultra | About 74 FPS | About 68 FPS | SteamOS |
| 1440p Ultra | About 45 FPS | About 43 FPS | SteamOS |
| 4K Ultra | About 18 FPS | About 20 FPS | Windows 11 |
The 4K percentage difference can look substantial because the underlying frame rates are very low. A change from 18 FPS to 20 FPS is mathematically around an 11% increase, but it is still only a two-frame-per-second difference in absolute terms.
Why Windows Won the Tested 4K Comparisons
Windows 11 finished ahead in all three reported 4K game comparisons. In Shadow of the Tomb Raider it achieved approximately 46 FPS compared with 44 FPS on SteamOS. Horizon Zero Dawn Remastered was reported at roughly 28 FPS on Windows and 26 FPS on SteamOS, while Cyberpunk 2077 was approximately 20 FPS versus 18 FPS.
These results show a consistent direction within this small 4K sample, but they do not establish that Windows will always be faster at 4K. Three games are not enough to characterize the entire PC gaming library, and differences in drivers, game patches, Proton releases, and graphics APIs can alter results significantly from one title to another.
They also need to be considered in the context of the Steam Machine's hardware class. Demanding modern games running natively at 4K with high or ultra settings can fall well below 60 FPS, so upscaling, reduced graphics settings, or frame generation may be more relevant to practical 4K use than small differences between the operating systems.
How Proton Affects SteamOS Gaming
Many Windows games running on SteamOS use Valve's Proton compatibility technology rather than executing through a native Windows environment. Proton translates Windows-oriented interfaces such as Direct3D into technologies available on Linux, including Vulkan through components such as DXVK and VKD3D-Proton.
It might appear intuitive that a translation layer must always make a game slower, but actual performance depends on much more than translation overhead. Graphics drivers, shader compilation, API implementation, CPU scheduling, memory management, and game-specific optimizations can all affect the final result.
As the benchmark demonstrates, a Proton-based game can sometimes run close to its Windows result and can occasionally run faster under a particular combination of hardware, game, graphics API, and software versions. That does not imply that Proton universally improves performance, just as native Windows execution does not guarantee that Windows will win every benchmark.
The Benchmark Has Important Testing Limitations
A direct operating-system comparison is difficult because both platforms must be tested under equivalent conditions. The reported Steam Machine comparison provides useful early data, but it should not be treated as an exhaustive Windows-versus-SteamOS study.
- Only a small number of games were included in the direct comparison.
- SteamOS CPU testing was conducted from desktop mode rather than its normal gaming mode.
- Performance can change with driver and operating-system updates.
- Individual games can behave differently under Proton.
- Average FPS alone does not describe frame-time consistency or visual differences.
- Graphics settings need to be verified carefully to ensure equivalent image quality.
Image-quality equivalence is especially important when interpreting very small performance differences. If two systems use different defaults, reconstruction methods, dynamic resolution behavior, or graphics options, identical-looking benchmark labels do not necessarily guarantee identical rendered workloads.
The Test Machine Was Not Using the Stock Memory Configuration
Another significant detail is that the tested Steam Machine had been upgraded to 64GB of DDR5-5600 memory running in dual-channel mode. The standard base configuration uses substantially less memory, so the published numbers should not automatically be assumed to represent an untouched retail configuration.
The upgraded memory was reportedly used for both operating systems, which makes the Windows-versus-SteamOS comparison more internally consistent. However, it limits how directly the resulting FPS numbers can be compared with results obtained from a stock Steam Machine.
The fairest interpretation is that the benchmark compares Windows 11 and SteamOS on the same modified test system, rather than providing a definitive performance specification for every retail Steam Machine.
Performance Is Only One Part of the Operating-System Choice
Similar frame rates do not make the two operating systems interchangeable. Windows still has broader compatibility with the traditional PC software ecosystem and with games or anti-cheat systems that do not operate correctly through Linux and Proton. It can therefore be useful when software compatibility outside the SteamOS environment is a priority.
SteamOS provides a gaming-focused interface designed around controller navigation and Valve's living-room experience. It also avoids requiring users to interact with a conventional Windows desktop for many routine gaming tasks.
Neither distinction can be captured by a frame-rate chart. Game compatibility, peripherals, desktop applications, interface preferences, power behavior, and the intended use of the machine can all be as important as a difference of several FPS.
How to Interpret the Results
The benchmark does not support the broad claim that SteamOS is substantially faster than Windows 11 across Steam Machine gaming, but it also does not show Windows delivering a general gaming-performance advantage comparable with its 22.1% Geekbench multi-core lead. In the games tested, the operating systems instead traded victories depending on title and resolution.
Windows 11's multi-core Geekbench result deserves attention, although the SteamOS desktop-mode testing condition makes further controlled testing useful. Windows also led each of the three reported 4K comparisons, while SteamOS produced notable advantages of its own, including the roughly 9% lead observed in Cyberpunk 2077 at native 1080p.
The most defensible reading of these early results is that gaming performance on the tested Steam Machine was generally close between Windows 11 and SteamOS, while synthetic CPU performance showed a much larger difference that cannot yet be cleanly generalized to gaming or every workload. More games, identical operating modes, frame-time measurements, stock-hardware testing, and verified image-quality settings would provide a stronger basis for broader conclusions.
Tags
Steam Machine, SteamOS vs Windows 11, Steam Machine benchmarks, SteamOS gaming performance, Windows 11 gaming, Proton gaming, Linux gaming, Steam Machine performance, Geekbench 6, PC gaming benchmarks
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