Originally Posted by atomicus
As far as I'm aware, it has nothing to do with the panels rather than G-Sync itself which is able to push it that high. So take G-Sync out of the equation on a panel that was hitting 100Hz, and you wouldn't no longer be able to achieve that with the same panel minus G-Sync.
Actually, my guess is that for the "Predator X34" G-sync displays the OEM panels have been specially tested to achieve 100Hz. In other words, it's not the G-sync module that provides the extra speed, it's the fact that Acer is buying premium panels for that particular monitor. That is part of the extra cost vs the Freesync model. The Freesync model gets panels that don't quite make it to 100Hz.
I say this because Freesync supports over 200Hz officially, and even Acer's XZ350CU supports Freesync up to 144Hz.
For us AMD owners, it would be nice to pay a premium for extra Hz, but I realize that's not profitable for Acer at this time. At least Freesync gets 75hz vs 60Hz, and a decent range down to 30Hz. AMD has implemented low framerate compensation in their latest drivers so even below 30Hz there should be no additional stutter.