Physical Dimensions & Thickness: The Anbernic RG28XX has a horizontal bar chassis measuring 125 × 56.5 × 16.5 mm, while the Retroid Pocket 4 Pro uses a horizontal bar chassis measuring 184.8 × 82.6 × 15.8 mm. In width, the Anbernic RG28XX is 59.8 mm (32.4%) narrower than the Retroid Pocket 4 Pro. In height, the Anbernic RG28XX is 26.1 mm (31.6%) shorter than the Retroid Pocket 4 Pro. In chassis thickness (depth), the Anbernic RG28XX is 0.7 mm (4.4%) thicker than the Retroid Pocket 4 Pro (16.5 mm vs 15.8 mm).
Footprint Area & Weight: Calculating surface footprint (width × height), the Anbernic RG28XX occupies 7,063 mm² (70.6 cm²), compared to 15,264 mm² (152.6 cm²) for the Retroid Pocket 4 Pro—a footprint difference of 8,201 mm² (53.7%). On the scale, the Anbernic RG28XX weighs 123g versus 261g for the Retroid Pocket 4 Pro, representing a 138g (52.9%) 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 Retroid Pocket 4 Pro'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 Retroid Pocket 4 Pro a 1.01" larger active 4:3 diagonal (84.2% 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 4.7" (100% screen usage) on the Retroid Pocket 4 Pro, making the Retroid Pocket 4 Pro larger by 2.1" (+227.4% active 16:9 area).
