Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | ASUS - ROG Ally X | Valve - Steam Deck LCD 256GB |
|---|---|---|
| Storage | 1024 GB | 256 GB |
| Max refresh | 120 Hz | 60 Hz |
| RAM | 24 GB | 16 GB |
| Ray tracing | true | false |
| VRR | true | false |
Between the ROG Ally X and Steam Deck LCD 256GB, the ROG Ally X comes out ahead in storage / max refresh, while the Steam Deck LCD 256GB wins on several specs. Overall, the ROG Ally X scores 63.2 and the Steam Deck LCD 256GB scores 47.8 on our Mars Score.
Which should you buy?
The ROG Ally X is the clear pick on raw spec strength, leading by 15.4 points on the Mars Score. The margin is wide enough that the underdog only makes sense if its individual strengths line up with what you specifically need.
Pick the ROG Ally X if you push the hardware — gaming, on-device AI, heavy multitasking — and the extra compute headroom is worth the trade-offs. The biggest gaps in its favor are storage, max refresh, ram, among others. The single most decisive one: Storage — 300.00% more. 1024 GB vs 256 GB.
The Steam Deck LCD 256GB similarly does not carry a headline advantage on the popular specs — look at the full table for category-specific deltas.
Both ship with comparable max resolution, disc drive, vr support, so those specs do not separate the two — focus on the differences below.
Bottom line: the ROG Ally X is the safer default. The other model is the right choice only when its specific advantages line up with your priorities.
Which should you buy: ASUS - ROG Ally X or Valve - Steam Deck LCD 256GB?
ASUS - ROG Ally X leads the current Mars Score by 15.4 points.The more useful decision is the trade-off behind that result: compare ram, storage, max refresh against the way you will actually use the product.
Choose ASUS - ROG Ally X if…
ASUS - ROG Ally X has the measurable edge on storage gb, max refresh hz, ram gb.
Choose Valve - Steam Deck LCD 256GB if…
Valve - Steam Deck LCD 256GB does not lead a decisive measured field here, so choose it for price, ecosystem, design, or availability when those matter more to you.
This is a structured comparison of the published catalog values. It is not a claim of identical real-world performance across every workload; use the linked spec drill-downs and methodology page to inspect the inputs.
Why ASUS - ROG Ally X wins
- ▲Storage — 300.00% more. 1024 GB vs 256 GB.
- ▲Max refresh — 100.00% more. 120 Hz vs 60 Hz.
- ▲RAM — 50.00% more. 24 GB vs 16 GB.
- ▲Has Ray tracing.
- ▲Has VRR.
Why Valve - Steam Deck LCD 256GB wins
- No decisive advantages.
Spec comparison
Performance
| Spec | ASUS - ROG Ally X | Valve - Steam Deck LCD 256GB |
|---|---|---|
| CPU | AMD Ryzen Z1 Extreme | AMD Zen 2 4-core |
| GPU | AMD RDNA 3 (~8.6 TFLOPS) | AMD RDNA 2 (1.6 TFLOPS) |
| RAMⓘ | 24 GBlead | 16 GB |
| Max resolution | 1080p | 1080p |
| Max refreshⓘ | 120 Hzlead | 60 Hz |
| Ray tracing | truelead | false |
| VRRⓘ | truelead | false |
Storage
| Spec | ASUS - ROG Ally X | Valve - Steam Deck LCD 256GB |
|---|---|---|
| Storageⓘ | 1024 GBlead | 256 GB |
| Storage typeⓘ | NVMe SSD | NVMe SSD |
| Expandable storageⓘ | true | true |
Design & I/O
| Spec | ASUS - ROG Ally X | Valve - Steam Deck LCD 256GB |
|---|---|---|
| Disc drive | false | false |
| HDMIⓘ | 0 | 0 |
| USB ports | 1 | 1 |
| Weight | 0.678 kg | 0.669 kglead |
| VR support | false | false |
Frequently asked
Does ROG Ally X or Steam Deck LCD 256GB have a disc drive?+
Neither has a disc drive.
Which has more storage, ROG Ally X or Steam Deck LCD 256GB?+
ROG Ally X ships with 1024GB of NVMe SSD.
Which supports higher refresh rates, ROG Ally X or Steam Deck LCD 256GB?+
ROG Ally X supports up to 120Hz vs 60Hz.