Physical Dimensions & Thickness: The ASUS ROG Ally X has a horizontal bar chassis measuring 280.2 × 114 × 36.9 mm, while the Retroid Pocket 3 Plus uses a horizontal bar chassis measuring 184.65 × 81.38 × 24.23 mm. In width, the ASUS ROG Ally X is 95.55 mm (51.7%) wider than the Retroid Pocket 3 Plus. In height, the ASUS ROG Ally X is 32.62 mm (40.1%) taller than the Retroid Pocket 3 Plus. In chassis thickness (depth), the ASUS ROG Ally X is 12.67 mm (52.3%) thicker than the Retroid Pocket 3 Plus (36.9 mm vs 24.23 mm).
Footprint Area & Weight: Calculating surface footprint (width × height), the ASUS ROG Ally X occupies 31,943 mm² (319.4 cm²), compared to 15,027 mm² (150.3 cm²) for the Retroid Pocket 3 Plus—a footprint difference of 16,916 mm² (112.6%). On the scale, the ASUS ROG Ally X weighs 678g versus 230g for the Retroid Pocket 3 Plus, representing a 448g (194.8%) weight difference (Retroid Pocket 3 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 Retroid Pocket 3 Plus's 4.7" (16:9) panel yields a 3.84" effective diagonal (75% active screen area with vertical pillarbox bars on the sides (native 16:9)). This gives the ASUS ROG Ally X a 1.88" larger active 4:3 diagonal (121.8% 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 4.7" (100% screen usage) on the Retroid Pocket 3 Plus, making the ASUS ROG Ally X larger by 2.3" (+121.8% active 16:9 area).
