It all depends on the game. For instance, try playing FFIX on a PC. There's a reason the game took up four discs -- they used relatively high res textures, and it looks a lot better. Most games have a mix of higher and lower res textures, just whatever the artists had and could get to work at the time. Most of the screenshots floating around are just the games running at a higher res; the re-textured ones are the exceptions. Just a resolution increase and anti-aliasing can do wonders. When stevey says vectors, he's talking about polygon edges. You still have that information, so it's not like upscaling a DVD, the edges will become sharper (e.g. like N64 Virtual Console games). Especially for something like Wind Waker, where most of the game isn't based around textures, but lighting and shading, you can get a big improvement. Emulators can also upscale textures to some extent with appropriate filtering. With enough power they could go one step further, and add in tessellation to increase the polygon count. Are they magically going to look like top PS3/360 games? No, but they will still look significantly better.