Compare ASUS ROG Ally (280×113×39 mm, 7" 16:9) vs Valve Steam Deck OLED (298×117×50 mm, 7.4" 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
Panel 16:9 with native resolution 1920x1080.
Valve Steam Deck OLED
Panel 16:10 with native resolution 1280x800.
Physical Dimensions & Thickness: The ASUS ROG Ally has a horizontal bar chassis measuring 280 × 113 × 39 mm, while the Valve Steam Deck OLED uses a horizontal bar chassis measuring 298 × 117 × 50 mm. In width, the ASUS ROG Ally is 18 mm (6%) narrower than the Valve Steam Deck OLED. In height, the ASUS ROG Ally is 4 mm (3.4%) shorter than the Valve Steam Deck OLED. In chassis thickness (depth), the ASUS ROG Ally is 11 mm (22%) slimmer than the Valve Steam Deck OLED (39 mm vs 50 mm).
Footprint Area & Weight: Calculating surface footprint (width × height), the ASUS ROG Ally occupies 31,640 mm² (316.4 cm²), compared to 34,866 mm² (348.7 cm²) for the Valve Steam Deck OLED—a footprint difference of 3,226 mm² (9.3%). On the scale, the ASUS ROG Ally weighs 608g versus 640g for the Valve Steam Deck OLED, representing a 32g (5%) weight difference (ASUS ROG Ally 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'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 OLED's 7.4" (16:10) panel yields a 6.54" effective diagonal (83% active screen area with vertical pillarbox bars on the sides (native 16:10)). This gives the Valve Steam Deck OLED a 0.82" larger active 4:3 diagonal (30.6% more active display area). For 16:9 widescreen content (PSP, Switch, streaming), the ASUS ROG Ally delivers a 7" effective diagonal (100% screen usage) versus 7.2" (90% screen usage) on the Valve Steam Deck OLED, making the Valve Steam Deck OLED larger by 0.2" (+5.8% active 16:9 area).
| Specification | ASUS ROG Ally | Valve Steam Deck OLED | Difference / Comparison |
|---|---|---|---|
| Dimensions (W × H × D) | 280 × 113 × 39 mm | 298 × 117 × 50 mm | ASUS ROG Ally is 29.2% smaller by volume |
| Width | 280 mm | 298 mm | 18 mm (6% vs Steam Deck OLED) |
| Height | 113 mm | 117 mm | 4 mm (3.4% vs Steam Deck OLED) |
| Thickness (Depth) | 39 mm | 50 mm | 11 mm (22% vs Steam Deck OLED) |
| Footprint Area (W × H) | 31,640 mm² (316.4 cm²) | 34,866 mm² (348.7 cm²) | 3,226 mm² (9.3% diff) |
| Chassis Volume | 1234 cm³ | 1743.3 cm³ | 509.3 cm³ (29.2% diff) |
| Weight | 608 g | 640 g | 32 g (5% diff) |
| Form Factor | Horizontal Bar | Horizontal Bar | Both Horizontal Bar |
| Native Screen Diagonal | 7" | 7.4" | 0.4" (5.7% larger on Steam Deck OLED) |
| Native Aspect Ratio | 16:9 | 16:10 | 16:9 vs 16:10 |
| Display Technology | IPS | OLED | IPS vs OLED |
| Native Resolution & Density | 1920x1080 (315 PPI) | 1280x800 (204 PPI) | 111 PPI sharper on ROG Ally |
| Effective 4:3 Screen Size (PS1, SNES, N64) | 5.72" (75% area, pillarbox) | 6.54" (83% area, pillarbox) | +0.82" (+30.6% area) on Steam Deck OLED |
| Effective 16:9 Screen Size (PSP, Streaming) | 7" (100% native, no bars) | 7.2" (90% area, letterbox) | +0.2" (+5.8% area) on Steam Deck OLED |
| Effective 3:2 Screen Size (Game Boy Advance) | 6.19" (84% area, pillarbox) | 7.07" (94% area, pillarbox) | +0.88" (+30.6% area) on Steam Deck OLED |
| Processor (SoC / CPU) | AMD Ryzen Z1 / AMD Ryzen Z1 Extreme | AMD Sephiroth | Different architecture |
| Memory (RAM) | 16 GB LPDDR5 (6400 MT/s) | 16 GB LPDDR5 | 16 GB LPDDR5 (6400 MT/s) vs 16 GB LPDDR5 |
| Battery Capacity | 5,195 mAh | 6,494 mAh | 1,299 mAh larger on Steam Deck OLED |
| 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 measures 280 × 113 × 39 mm (footprint: 31,640 mm² / 316.4 cm²), whereas the Valve Steam Deck OLED measures 298 × 117 × 50 mm (footprint: 34,866 mm² / 348.7 cm²). Compared to the Valve Steam Deck OLED, the ASUS ROG Ally is 18 mm (6%) narrower, 4 mm (3.4%) shorter, 11 mm (22%) slimmer, and 3,226 mm² (9.3%) smaller in footprint area. In weight, the ASUS ROG Ally is 32g (5%) lighter (608g vs 640g).
The Valve Steam Deck OLED delivers a larger active 4:3 image by 0.82" diagonal (30.6% more active display area) than the ASUS ROG Ally. Specifically, the ASUS ROG Ally 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 OLED has a 7.4" 16:10 OLED screen (1280x800) that yields a 6.54" 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 Valve Steam Deck OLED provides a larger viewable image at 7.2" effective diagonal compared to 7" on the ASUS ROG Ally (+0.2", or 5.8% more active widescreen area). On 16:9 content, the ASUS ROG Ally operates at 100% full screen without black bars (native 16:9), while the Valve Steam Deck OLED operates at 90% active screen area with horizontal letterbox bars on top and bottom (native 16:10).
Yes, the ASUS ROG Ally is more compact and pocketable than the Valve Steam Deck OLED, with a smaller overall chassis volume (1234 cm³ vs 1743.3 cm³). The ASUS ROG Ally uses a horizontal bar form factor (280 mm wide × 39 mm thick, 608g), whereas the Valve Steam Deck OLED uses a horizontal bar form factor (298 mm wide × 50 mm thick, 640g). Overall, the ASUS ROG Ally is easier to carry in a pocket due to its slimmer 39 mm profile and smaller physical footprint.
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