What Is a Steam Deck? A PC That Happens to Be Handheld

It is a computer, not a console. Steam Deck runs SteamOS 3, which Valve describes as Arch-based — Linux — with a full KDE Plasma desktop underneath. Nearly everything people find surprising about it follows from that one fact.

A console runs a fixed, certified library. A PC runs whatever it can be persuaded to run, at whatever speed the hardware allows, and hands you a desktop if you want one.

What is actually inside

Valve publishes the whole sheet. The LCD model:

	Steam Deck (LCD)
Processor	7nm AMD APU — Zen 2, 4 cores / 8 threads; 8 RDNA 2 compute units
Power envelope	4–15W
Memory	16GB LPDDR5
Screen	7", 1280 × 800 IPS, 400 nits, 60Hz
Battery	40Whr, 2–8 hours of gameplay
Weight	~669g

The number that explains the most is 4–15W. That is the entire power budget for processor and graphics together — roughly what a phone charger delivers. A desktop graphics card alone can draw twenty times it. Everything the Deck does well is a consequence of working inside fifteen watts, and so is everything it cannot do.

Why the battery figure is a range

Valve quotes “2 - 8 hours of gameplay”. That is a fourfold spread, and it is the honest answer rather than an evasive one.

A demanding 3D title pushes the APU to the top of its envelope. A 2D indie game or an emulated console sits near the bottom. Same battery, same machine, four times the difference — so any single number would be wrong for most people. Most vendors pick the flattering end and print that.

The OLED is a revision, not an upgrade

This catches people out, and the two spec sheets settle it. The OLED model keeps the same 1280 × 800 resolution and the same 298 × 117 × 49mm body. It is not faster.

What changed is everything around the silicon:

	LCD	OLED
Screen	7", IPS, 400 nits	7.4", HDR OLED, 1,000 nits peak
Refresh	60Hz	up to 90Hz
Battery	40Whr, 2–8h	50Whr, 3–12h
Wi-Fi	Wi-Fi 5, dual-band	Wi-Fi 6E, tri-band
Bluetooth	5.0	5.3
Weight	~669g	~640g

Bigger screen, longer battery, lighter. The same chip, given a better body — which is a meaningfully different proposition from a generational jump, and worth knowing before paying the difference.

Where it sits in Valve’s hardware now

Valve’s own hardware page currently lists four products: Steam Deck, Steam Controller, Steam Machine and Steam Frame. The Deck is no longer the whole story, which is most of why searches around Valve hardware have risen sharply this year.

We are not going to characterise the other three until we can source their specifications the way we have sourced these. Naming what exists is reporting; describing what it does before Valve has published it is not.

What to actually do

• Judge it as a PC. Ask what it runs and how fast, not whether a game is “supported”. Valve’s per-title compatibility ratings are the thing to check before buying for a specific game.
• Expect to manage settings. Fifteen watts means trading resolution, frame cap and detail. People who enjoy the Deck are generally people who do not mind that; people who want to press play and never think about it often prefer a console.
• Choose OLED for the screen and the battery, not for speed. If someone tells you it performs better, the two spec sheets above disagree.
• Budget for storage. Every model takes a microSD card, and games are large. That expansion slot is doing real work.
• If a handheld’s battery life is your main worry, the range Valve publishes is the most honest figure in the category — treat any competitor quoting a single number with more suspicion, not less.