You can get better video output from the Wii than RCA. It won't be 4K but it will be much sharper: https://electron-shepherd.com/products/electronwarp https://

You can get better video output from the Wii than RCA. It won't be 4K but it will be much sharper: https://electron-shepherd.com/products/electronwarp https://electron-shepherd.com/products/electronwarp There was also an official component cable which would look much nicer than the composite that the Wii comes with. But your 4K tv almost definitely don't have component input.