480p 60hz with RGB scart lead? How?

So right now the only possible resolution I can display my PS3 in is 576i, I see no options what so ever to 480p. I've just learned that 576 is a 50hz resolution which is something I don't really want. My TV is capable of running at 60hz both with and without RGB but I can't for the life of me set it up. I'm using the same RGB scart lead I was using with the PS2, it had no problems on that system, plug in and run something 60hz, no problems. Now for the life of me I can't get out of 576i. Why can't it be simple like on the 360 lol? "50hz or 60hz?" Your choice! Also, the reson I ended up in this resolution was because I found games such as MGS4 to have boarders on both the top and bottom of the screen. I'm lost...