On the PAL cubes (Europe and Aus.), you can boot the games up in 60 Hz mode by holding down B (your TV must be 60Hz compatible). Using an RGB cable truly takes advantge of this feature.
On the NTSC cubes (USA and Can.), you can boot up games in Progressive scan (not all games have this mode) by holding down B. You must also have a Progressive Scan enabled TV, and the component cable for this to work.
Oh, and Progressive Scan is totally different from 60Hz... And it's much better.
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