Physical Dimensions & Thickness: The ASUS ROG Ally has a horizontal bar chassis measuring 280 × 113 × 39 mm, while the Powkiddy RGB30 uses a 1:1 square chassis measuring 145 × 86.5 × 18 mm. In width, the ASUS ROG Ally is 135 mm (93.1%) wider than the Powkiddy RGB30. In height, the ASUS ROG Ally is 26.5 mm (30.6%) taller than the Powkiddy RGB30. In chassis thickness (depth), the ASUS ROG Ally is 21 mm (116.7%) thicker than the Powkiddy RGB30 (39 mm vs 18 mm).
Footprint Area & Weight: Calculating surface footprint (width × height), the ASUS ROG Ally occupies 31,640 mm² (316.4 cm²), compared to 12,543 mm² (125.4 cm²) for the Powkiddy RGB30—a footprint difference of 19,097 mm² (152.3%). On the scale, the ASUS ROG Ally weighs 608g versus 207g for the Powkiddy RGB30, representing a 401g (193.7%) weight difference (Powkiddy RGB30 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 Powkiddy RGB30's 4" (1:1) panel yields a 3.54" effective diagonal (75% active screen area with horizontal letterbox bars on top and bottom (native 1:1)). This gives the ASUS ROG Ally a 2.18" larger active 4:3 diagonal (161.7% 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 3.25" (56% screen usage) on the Powkiddy RGB30, making the ASUS ROG Ally larger by 3.75" (+365.3% active 16:9 area).