I’m using the “Pi 2” setting on my Pi 2. I don’t think there’s any appreciable difference between this setting and “turbo,” except that turbo is a lot less stable and causes my pi to freeze at startup.

I think turbo is like 100mhz faster or something. Not really worth it IMO. PSX runs at 100% speed with the hyllian glow shader, I’m a happy camper. :)