Physical Dimensions & Thickness: The Anbernic RG353V has a vertical (game boy style) chassis measuring 83 × 126 × 21 mm, while the ASUS ROG Ally X uses a horizontal bar chassis measuring 280.2 × 114 × 36.9 mm. In width, the Anbernic RG353V is 197.2 mm (70.4%) narrower than the ASUS ROG Ally X. In height, the Anbernic RG353V is 12 mm (10.5%) taller than the ASUS ROG Ally X. In chassis thickness (depth), the Anbernic RG353V is 15.9 mm (43.1%) slimmer than the ASUS ROG Ally X (21 mm vs 36.9 mm).
Footprint Area & Weight: Calculating surface footprint (width × height), the Anbernic RG353V occupies 10,458 mm² (104.6 cm²), compared to 31,943 mm² (319.4 cm²) for the ASUS ROG Ally X—a footprint difference of 21,485 mm² (67.3%). On the scale, the Anbernic RG353V weighs 180g versus 678g for the ASUS ROG Ally X, representing a 498g (73.5%) weight difference (Anbernic RG353V is lighter).
4:3 vs 16:9 Effective Viewable Screen Size: For classic 4:3 retro games (PS1, SNES, N64, Dreamcast), the Anbernic RG353V's 3.5" (4:3) panel yields a 3.5" effective diagonal (100% full screen without black bars (native 4:3)), while 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)). This gives the ASUS ROG Ally X a 2.22" larger active 4:3 diagonal (167% more active display area). For 16:9 widescreen content (PSP, Switch, streaming), the Anbernic RG353V delivers a 3.21" effective diagonal (75% screen usage) versus 7" (100% screen usage) on the ASUS ROG Ally X, making the ASUS ROG Ally X larger by 3.79" (+374.8% active 16:9 area).