Thank you, smf. This is what I was getting at, but didn't have the tech knowledge to explain it 
> > You can ran MAME at 120Hz or 144Hz with "classic" double buffering (and throttle)
> > anyway.
>
> It's not the same thing. Without G-Sync you will get harmonics between the games
> refresh rate and the monitors refresh rate. You'll end up with some frames being
> visible for longer than others, which makes movement appear jerky like if you try to
> display a 24fps bluray on a 60hz TV. Your only alternative is to cheat and run the
> game at the wrong refresh rate.
>
> With G-Sync you have the link from the graphics card to the monitor set at the
> highest speed (maybe 144hz, maybe more) and pacman can present frames at 60.606060hz.
> G-Sync is basically about allowing arbitrary delays between frames that can then be
> sent instantly and not wait for the next 144hz slot.
>
> For that reason I don't believe that what G-Sync claims to do can be implemented with
> current technology.
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