Physical Dimensions & Thickness: The ASUS ROG Ally X has a horizontal bar chassis measuring 280.2 × 114 × 36.9 mm, while the AYN Odin 2 uses a horizontal bar chassis measuring 225 × 98 × 17 mm. In width, the ASUS ROG Ally X is 55.2 mm (24.5%) wider than the AYN Odin 2. In height, the ASUS ROG Ally X is 16 mm (16.3%) taller than the AYN Odin 2. In chassis thickness (depth), the ASUS ROG Ally X is 19.9 mm (117.1%) thicker than the AYN Odin 2 (36.9 mm vs 17 mm).
Footprint Area & Weight: Calculating surface footprint (width × height), the ASUS ROG Ally X occupies 31,943 mm² (319.4 cm²), compared to 22,050 mm² (220.5 cm²) for the AYN Odin 2—a footprint difference of 9,893 mm² (44.9%). On the scale, the ASUS ROG Ally X weighs 678g versus 420g for the AYN Odin 2, representing a 258g (61.4%) weight difference (AYN Odin 2 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 AYN Odin 2's 6" (16:9) panel yields a 4.9" effective diagonal (75% active screen area with vertical pillarbox bars on the sides (native 16:9)). This gives the ASUS ROG Ally X a 0.82" larger active 4:3 diagonal (36.1% 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" (100% screen usage) on the AYN Odin 2, making the ASUS ROG Ally X larger by 1" (+36.1% active 16:9 area).