The short answer
- Raw GPU throughput: the Xbox Series X leads. Its custom RDNA 2 GPU has 52 compute units. Windows Central's analysis puts the Series X at 12.15 TFLOPS of FP32 power. The Steam Machine's GPU has 28 compute units.
- Architecture generation: the Steam Machine leads. It uses a semi-custom Zen 4 CPU (6 cores, 12 threads) and an RDNA 3 GPU. The Xbox uses Zen 2 and RDNA 2, a design from 2020.
- Real-world game performance: unsettled. None of the material gathered here includes matched benchmarks of the same games at the same settings on both machines.
What the specs say
The Steam Machine figures are from Valve. Ars Technica's launch report says both versions run on a custom six-core AMD Zen 4 CPU with a peak clock of 4.8GHz. It adds that the integrated RDNA 3 GPU has 28 compute units and 8GB of dedicated VRAM. The system also has its own 16GB of DDR5. The Xbox Series X is an 8-core Zen 2 machine with 52 compute units and 16 GB of GDDR6 shared across the whole system. Those are Microsoft's listed specs.
| Steam Machine | Xbox Series X | |
|---|---|---|
| CPU | Semi-custom Zen 4, 6 cores / 12 threads | Custom Zen 2, 8 cores |
| GPU | Semi-custom RDNA 3, 28 CUs | Custom RDNA 2, 52 CUs |
| Memory | 16 GB DDR5 plus 8 GB GDDR6 VRAM | 16 GB GDDR6, shared |
| OS | SteamOS (Linux-based) | Xbox OS |
| Optical drive | No | Yes (disc model) |
The two machines handle memory differently. The Xbox uses one pool of fast GDDR6 for everything. The Steam Machine splits memory the way a PC does, with system RAM and a separate VRAM pool. Console-style unified memory and PC-style split memory behave differently in practice, so a bigger total doesn't settle anything.
The TFLOPS caveat
BGR says the Steam Machine is "estimated" at nearly 9 TFLOPS, and the word matters. Tech Insider reports that Valve still hasn't published an official teraflops figure for the machine. It says independent estimates of roughly 8.8 TFLOPS are not official. Notebookcheck's estimate is close, at 8.9 TFLOPS against 12.15 for the Xbox Series X.
Estimates aren't unanimous, though. Early on, Windows Central assumed the GPU would land near an RX 7600M laptop part and reasoned it was "not a stretch" to expect about 17.27 TFLOPS. That figure comes from dual-issue counting on RDNA 3, and it's why TFLOPS comparisons across GPU generations are risky. RDNA 3 can double-count certain operations on paper that games rarely exploit fully. The ~9 TFLOPS estimates seem more conservative. Neither is a measurement of how a game will run.
Tom's Guide takes a middle position. It says the Steam Machine lands in roughly similar territory to the PS5, but a little behind the Xbox Series X graphically. It also notes that the Steam Machine supports more of AMD's modern resolution scaling tech through RDNA 3.
So the Xbox has more raw GPU muscle, and the Steam Machine has newer upscaling support. Whether the newer features close the gap depends on the game.
Where the BGR piece needs qualifying
- "Better AI support through FSR." FSR is an upscaling technology. The specs reviewed here don't show a specific AI feature that gives the Steam Machine an advantage. Treat that claim as unverified.
- "Surprisingly even." The spec sheets lean toward the Xbox on GPU. The Steam Machine's newer CPU matters, but this is not an even match on the published numbers. Without matched benchmarks, "even" is a judgment call.
- Launch timing. Valve announced the machine on Nov. 12, 2025, with a release described then as early next year, date and prices TBC, per Rock, Paper, Shotgun. Ars Technica reported that shipments began June 29, but only through a reservation queue. "Launched in June 2026" is accurate in the sense that orders started shipping. It does not mean anyone could walk in and buy one.
Price: the gap depends on date and model
BGR sets a $1,049 Steam Machine against an $800 Xbox Series X.
- Steam Machine: Ars Technica reports $1,049 for 512GB and $1,349 for the 2TB model. A Steam Controller adds $79 to either one. That matters, because BGR's price comparison counts the Xbox's included controller but not the Steam Machine's.
- Xbox Series X: the $800 figure matches the post-hike price of $799.99 after the Aug 1 Xbox price hike that Tech Insider cites. A Microsoft store listing seen during research showed a different starting price of $749.99 across several models, and it showed the console out of stock. I couldn't open that page myself, so treat the $749.99 figure as unconfirmed. Prices vary by model, region and retailer.
The comparison you should make is a like-for-like one. The base Steam Machine has no controller and 512GB of storage. The Series X ships with a controller and 1 TB. On those terms the Xbox is the cheaper box by roughly $250 to $300, depending on which Xbox price you use. A controller bundle narrows that gap a little.
Ars Technica also explains the price. Valve said it began sourcing parts in 2023 and expected a much cheaper machine, and that the original vision is "no longer viable". Memory and storage costs rose sharply. Valve warned that pricing could change in later batches.
What the spec sheet doesn't capture
BGR raises several practical points:
- Upgradeability. The Steam Machine is a PC, so memory can be upgraded. The Xbox can't be. Tech reviewers describe the SteamOS machine's DDR5 as a user-upgradeable module.
- Anti-cheat. Many online multiplayer games use kernel-level anti-cheat built for Windows, and SteamOS is Linux-based. BGR says you can install Windows on the Steam Machine, but check your games first.
- Software stores. The Steam Machine can run other launchers, and Linux-compatible mods work. The Xbox brings Game Pass and a disc drive, which the Steam Machine lacks.
- Efficiency. The Steam Machine is much smaller. Estimates put gaming power draw near 170–200W, but that figure comes from a third-party site, not Valve.
Who should buy which
- Choose the Xbox Series X if you want the lowest price, a disc drive, Game Pass, or competitive online games with strict anti-cheat. It also has the higher raw GPU spec.
- Choose the Steam Machine if you have a large Steam library, want mods and other launchers, or like the idea of a small, upgradeable box. It also has the newer CPU and GPU architecture.
- Wait for benchmarks if raw frame rates decide it for you. The Steam Machine is going to lean on upscaling and tuned settings to hit 60 FPS in demanding titles, as BGR notes for Forza Horizon 6.
Bottom line
The Xbox Series X is the stronger GPU on paper: more compute units and a higher TFLOPS rating, with Microsoft's 12 TFLOPS figure against an unofficial ~9 for the Steam Machine. The Steam Machine is the newer design and a more flexible PC. It also costs more, at $1,049 versus roughly $750–$800 for a Series X. Real-world results will depend on the game, the settings and how well upscaling works. Until someone publishes matched tests, "more powerful" is true for the Xbox's GPU specs and not much else.