@mitu @KN4THX yes, I use Rpi 3b power supply and it freezes completely - I can't do absolutely anything and can only unplug the rpi and plug it back in.

@3DMaster are you talking about raspi-config? That's a standard Raspbian app and not part of RetroPie.

the link is quite clear on this.

the emulators in retropie (at least, the ones available for pi3) use a fraction of the default GPU memory, so raising the split does nothing but take more ram away from the system, where it IS needed (for compilations, etc).