Compare ASUS ROG Ally X (280.2×114×36.9 mm, 7" 16:9) vs Valve Steam Deck (298×117×49 mm, 7" 16:10) side-by-side at true 1:1 millimeter scale.
Silhouettes and screens to true relative scale (mm). Inner rectangle represents the physical screen.
ASUS ROG Ally X
Panel 16:9 with native resolution 1920x1080.
Valve Steam Deck
Panel 16:10 with native resolution 1280x800.
Physical Dimensions & Thickness: The ASUS ROG Ally X has a horizontal bar chassis measuring 280.2 × 114 × 36.9 mm, while the Valve Steam Deck uses a horizontal bar chassis measuring 298 × 117 × 49 mm. In width, the ASUS ROG Ally X is 17.8 mm (6%) narrower than the Valve Steam Deck. In height, the ASUS ROG Ally X is 3 mm (2.6%) shorter than the Valve Steam Deck. In chassis thickness (depth), the ASUS ROG Ally X is 12.1 mm (24.7%) slimmer than the Valve Steam Deck (36.9 mm vs 49 mm).
Footprint Area & Weight: Calculating surface footprint (width × height), the ASUS ROG Ally X occupies 31,943 mm² (319.4 cm²), compared to 34,866 mm² (348.7 cm²) for the Valve Steam Deck—a footprint difference of 2,923 mm² (8.4%). On the scale, the ASUS ROG Ally X weighs 678g versus 674g for the Valve Steam Deck, representing a 4g (0.6%) weight difference (Valve Steam Deck is lighter).
4:3 vs 16:9 Effective Viewable Screen Size: For classic 4:3 retro games (PS1, SNES, N64, Dreamcast), the ASUS ROG Ally X's 7" (16:9) panel yields a 5.72" effective diagonal (75% active screen area with vertical pillarbox bars on the sides (native 16:9)), while the Valve Steam Deck's 7" (16:10) panel yields a 6.18" effective diagonal (83% active screen area with vertical pillarbox bars on the sides (native 16:10)). This gives the Valve Steam Deck a 0.46" larger active 4:3 diagonal (16.9% more active display area). For 16:9 widescreen content (PSP, Switch, streaming), the ASUS ROG Ally X delivers a 7" effective diagonal (100% screen usage) versus 6.81" (90% screen usage) on the Valve Steam Deck, making the ASUS ROG Ally X larger by 0.19" (+5.6% active 16:9 area).
| Specification | ASUS ROG Ally X | Valve Steam Deck | Difference / Comparison |
|---|---|---|---|
| Dimensions (W × H × D) | 280.2 × 114 × 36.9 mm | 298 × 117 × 49 mm | ASUS ROG Ally X is 31% smaller by volume |
| Width | 280.2 mm | 298 mm | 17.8 mm (6% vs Steam Deck) |
| Height | 114 mm | 117 mm | 3 mm (2.6% vs Steam Deck) |
| Thickness (Depth) | 36.9 mm | 49 mm | 12.1 mm (24.7% vs Steam Deck) |
| Footprint Area (W × H) | 31,943 mm² (319.4 cm²) | 34,866 mm² (348.7 cm²) | 2,923 mm² (8.4% diff) |
| Chassis Volume | 1178.7 cm³ | 1708.4 cm³ | 529.7 cm³ (31% diff) |
| Weight | 678 g | 674 g | 4 g (0.6% diff) |
| Form Factor | Horizontal Bar | Horizontal Bar | Both Horizontal Bar |
| Native Screen Diagonal | 7" | 7" | Same diagonal |
| Native Aspect Ratio | 16:9 | 16:10 | 16:9 vs 16:10 |
| Display Technology | IPS | IPS | Both IPS |
| Native Resolution & Density | 1920x1080 (315 PPI) | 1280x800 (216 PPI) | 99 PPI sharper on ROG Ally X |
| Effective 4:3 Screen Size (PS1, SNES, N64) | 5.72" (75% area, pillarbox) | 6.18" (83% area, pillarbox) | +0.46" (+16.9% area) on Steam Deck |
| Effective 16:9 Screen Size (PSP, Streaming) | 7" (100% native, no bars) | 6.81" (90% area, letterbox) | +0.19" (+5.6% area) on ROG Ally X |
| Effective 3:2 Screen Size (Game Boy Advance) | 6.19" (84% area, pillarbox) | 6.69" (94% area, pillarbox) | +0.5" (+16.9% area) on Steam Deck |
| Processor (SoC / CPU) | AMD Ryzen Z1 Extreme | AMD Aerith / Van Gogh | Different architecture |
| Memory (RAM) | 24 GB LPDDR5X (7500 MT/s) | 16 GB LPDDR5 | 24 GB LPDDR5X (7500 MT/s) vs 16 GB LPDDR5 |
| Battery Capacity | 10,390 mAh | 5,195 mAh | 5,195 mAh larger on ROG Ally X |
| Operating System | Windows 11 | SteamOS 3.0 (Arch Linux), Windows 11, etc | Windows 11 vs SteamOS 3.0 (Arch Linux), Windows 11, etc |
The ASUS ROG Ally X measures 280.2 × 114 × 36.9 mm (footprint: 31,943 mm² / 319.4 cm²), whereas the Valve Steam Deck measures 298 × 117 × 49 mm (footprint: 34,866 mm² / 348.7 cm²). Compared to the Valve Steam Deck, the ASUS ROG Ally X is 17.8 mm (6%) narrower, 3 mm (2.6%) shorter, 12.1 mm (24.7%) slimmer, and 2,923 mm² (8.4%) smaller in footprint area. In weight, the ASUS ROG Ally X is 4g (0.6%) heavier (678g vs 674g).
The Valve Steam Deck delivers a larger active 4:3 image by 0.46" diagonal (16.9% more active display area) than the ASUS ROG Ally X. Specifically, the ASUS ROG Ally X has a 7" 16:9 IPS screen (1920x1080) that yields a 5.72" effective 4:3 diagonal (75% active screen area with vertical pillarbox bars on the sides (native 16:9)). The Valve Steam Deck has a 7" 16:10 IPS screen (1280x800) that yields a 6.18" effective 4:3 diagonal (83% active screen area with vertical pillarbox bars on the sides (native 16:10)).
For 16:9 widescreen gaming (PSP, Switch, and game streaming), the ASUS ROG Ally X provides a larger viewable image at 7" effective diagonal compared to 6.81" on the Valve Steam Deck (+0.19", or 5.6% more active widescreen area). On 16:9 content, the ASUS ROG Ally X operates at 100% full screen without black bars (native 16:9), while the Valve Steam Deck operates at 90% active screen area with horizontal letterbox bars on top and bottom (native 16:10).
Yes, the ASUS ROG Ally X is more compact and pocketable than the Valve Steam Deck, with a smaller overall chassis volume (1178.7 cm³ vs 1708.4 cm³). The ASUS ROG Ally X uses a horizontal bar form factor (280.2 mm wide × 36.9 mm thick, 678g), whereas the Valve Steam Deck uses a horizontal bar form factor (298 mm wide × 49 mm thick, 674g). Overall, the ASUS ROG Ally X is easier to carry in a pocket due to its slimmer 36.9 mm profile and smaller physical footprint.
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