Physical Dimensions & Thickness: The ASUS ROG Ally X has a horizontal bar chassis measuring 280.2 × 114 × 36.9 mm, while the Miyoo Mini Plus uses a vertical (game boy style) chassis measuring 78.5 × 108 × 22.3 mm. In width, the ASUS ROG Ally X is 201.7 mm (256.9%) wider than the Miyoo Mini Plus. In height, the ASUS ROG Ally X is 6 mm (5.6%) taller than the Miyoo Mini Plus. In chassis thickness (depth), the ASUS ROG Ally X is 14.6 mm (65.5%) thicker than the Miyoo Mini Plus (36.9 mm vs 22.3 mm).
Footprint Area & Weight: Calculating surface footprint (width × height), the ASUS ROG Ally X occupies 31,943 mm² (319.4 cm²), compared to 8,478 mm² (84.8 cm²) for the Miyoo Mini Plus—a footprint difference of 23,465 mm² (276.8%). On the scale, the ASUS ROG Ally X weighs 678g versus 162g for the Miyoo Mini Plus, representing a 516g (318.5%) weight difference (Miyoo Mini Plus 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 Miyoo Mini Plus's 3.5" (4:3) panel yields a 3.5" effective diagonal (100% full screen without black bars (native 4:3)). 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 ASUS ROG Ally X delivers a 7" effective diagonal (100% screen usage) versus 3.21" (75% screen usage) on the Miyoo Mini Plus, making the ASUS ROG Ally X larger by 3.79" (+374.8% active 16:9 area).