"The dimensions of this model are 10" width by 8" length by 3.5" height. When opened, the cartridge slot door adds an additional 1" height to the unit." - Nes Wikia
"All officially licensed NTSC-U and PAL region cartridges, or "carts", are 5.25 inches (13.3 cm) tall, 4.75 inches (12 cm) wide and 0.75 inches (2 cm) thick." - Wiki
"All officially licensed NTSC-U and PAL region cartridges, or "carts", are 5.25 inches (13.3 cm) tall, 4.75 inches (12 cm) wide and 0.75 inches (2 cm) thick." - Wiki