Steam Is Running on Nintendo Switch — But Hold On
Valve snuck ARM support into Proton 11.0-Beta1 and now Steam runs on Nintendo Switch. Here is what it means and where it actually works.
Valve just quietly dropped something big in Proton 11.0-Beta1. Buried in the release notes: "Added FEX-2604 for ARM64EC builds." That one line is why Steam is now running on a Nintendo Switch — and why the broader ARM handheld gaming scene is buzzing.
What FEX-2604 Actually Does
FEX (Fast x86 Emulation on ARM) is an open-source translation layer that converts x86 processor instructions into ARM-compatible ones on the fly. It lets software written for Intel/AMD chips run on ARM hardware without recompilation. By bundling FEX-2604 into Proton, Valve has opened a door for Steam and x86 Windows games to run on ARM Linux devices — including handhelds that most gamers had written off as PC gaming dead zones.
The FEX-2604 release specifically improves x87 transcendental math functions — the kind used heavily in older games like Fallout: New Vegas. Early benchmarks show a 3.7x speedup for certain operations in that game alone. It also reduces memory overhead, which matters a lot on constrained handheld hardware.
So Steam Is Running on Switch — Kind Of
A modder successfully got Steam's UI booting on a Nintendo Switch using the new Proton ARM build. The internet understandably lost its mind. But before you start dreaming of playing Elden Ring on your Switch, there are some real caveats here.
The Switch's hardware is genuinely old at this point:
- Quad-core CPU at 1.0–1.8 GHz
- An aging Maxwell GPU
- 4GB of RAM
- A Linux kernel too outdated to handle FEX's full workload
What the modder demonstrated is a proof-of-concept, not a gaming solution. The Switch kernel limitation alone makes serious gaming through Proton a non-starter on that specific hardware. Still, watching Steam load on a Switch is a wild thing to see.
Where It Actually Works Well
The real story here is the ARM Android handheld ecosystem. Devices like the Ayn Odin 2 Portal, Retroid Pocket 5, and Ayaneo handhelds are running modern Snapdragon chips with way more headroom. On those devices, the results are genuinely impressive:
- Hollow Knight: Silksong — consistently above 100 FPS on the Odin 2 Portal's 120 Hz panel
- Half-Life 2 — comfortably over 120 FPS
- Cuphead — 60–70 FPS, smooth and playable
The community has been sharing working builds across social media all week, with new game compatibility reports coming in daily.
The Steam Frame Connection
Here's why Valve is doing this at all: the rumored Steam Frame. It's a VR headset powered by a Snapdragon 8 Gen 3 — an ARM chip. Valve quietly prepping ARM Proton support lines up perfectly with that hardware needing to run Steam games natively.
Valve is also building a "Verified" compatibility list specifically for ARM hardware, similar to the Steam Deck Verified program. That means curated, tested game lists for ARM devices are coming. This is not a one-off experiment — it is infrastructure work.
What This Means for Handheld Gaming
The ARM handheld space has always been awkward — great hardware, limited PC game access. Proton on ARM changes that calculus significantly. If Valve ships a mature ARM Proton with proper verified game support, the Retroid and AYN crowd suddenly has access to a massive chunk of the Steam catalog without relying on cloud streaming.
For Switch owners specifically: this is a "watch this space" situation. The Switch is not the target device here — it is just the flashy headline. The real takeaway is that Valve is building toward an ARM future, whether that is the Steam Frame, a next-gen Steam Deck variant, or broader ecosystem support. FEX-2604 in Proton 11 is a meaningful step. Keep an eye on this one.