Physical Dimensions & Thickness: The Anbernic RG28XX has a horizontal bar chassis measuring 125 × 56.5 × 16.5 mm, while the Anbernic RG35XX H uses a horizontal bar chassis measuring 145 × 69 × 16 mm. In width, the Anbernic RG28XX is 20 mm (13.8%) narrower than the Anbernic RG35XX H. In height, the Anbernic RG28XX is 12.5 mm (18.1%) shorter than the Anbernic RG35XX H. In chassis thickness (depth), the Anbernic RG28XX is 0.5 mm (3.1%) thicker than the Anbernic RG35XX H (16.5 mm vs 16 mm).
Footprint Area & Weight: Calculating surface footprint (width × height), the Anbernic RG28XX occupies 7,063 mm² (70.6 cm²), compared to 10,005 mm² (100.1 cm²) for the Anbernic RG35XX H—a footprint difference of 2,942 mm² (29.4%). On the scale, the Anbernic RG28XX weighs 123g versus 180g for the Anbernic RG35XX H, representing a 57g (31.7%) weight difference (Anbernic RG28XX is lighter).
4:3 vs 16:9 Effective Viewable Screen Size: For classic 4:3 retro games (PS1, SNES, N64, Dreamcast), the Anbernic RG28XX's 2.83" (4:3) panel yields a 2.83" effective diagonal (100% full screen without black bars (native 4:3)), while the Anbernic RG35XX H's 3.5" (4:3) panel yields a 3.5" effective diagonal (100% full screen without black bars (native 4:3)). This gives the Anbernic RG35XX H a 0.67" larger active 4:3 diagonal (53% more active display area). For 16:9 widescreen content (PSP, Switch, streaming), the Anbernic RG28XX delivers a 2.6" effective diagonal (75% screen usage) versus 3.21" (75% screen usage) on the Anbernic RG35XX H, making the Anbernic RG35XX H larger by 0.61" (+53% active 16:9 area).