bystander :
Jeff Gilleese :
I know they don't flicker, my point is how they don't. All Nvidia is doing is creating a new standerd that allows for frames to be transmitted to the monitor at a dynamic frequcy rather than a fixed one. This is sum what pointless as it doesn't prevent the GPU itself from failing to generate frame updates fast enough to not be perceived by the Human eye. This is akin to buying high price wax to wax your rusty car. Most people can't tell the difference in expincive or cheap car wax, but neither one is going to fix the rust. You would be better off saving you money on the wax and get a new paint job.
Just read all the reviews on it. Clearly it makes a massive difference in gaming. At least 1st person gaming. Everyone who has it has commented on never going back again. It is not something small. It is not a gimmick. It is the way that many people have wanted their monitors to behave for years. Ever since LCD's were created.
The huge difference between having G-sync and V-sync is when things aren't perfectly smooth at max refresh rate, G-sync keeps all the frames smooth. V-sync causes stuttering and also causes latency, even when you are at max refresh rate.
G-sync doesn't smooth out inconsistent fps caused by an under powered computer. It can only dynamicly lower the display frequency to prevent frames from being dropped. So this technology is most effective when the frame rate is less than 60Hz and consistent, like a video recorded at a lower frame rate. Thing is there are already solutions for this called pulldown and interpolation. Movies are filmed at 24Hz and to make that sync to 30Hz they do a thing called 3-2 pulldown.
Most likely what most reviewers are bragging about is actually a combination of the quality, power and condition of the computers they are running the demo on. Most shuddering is caused by too many background programs running at the same time as your game.
Its something like what's happening in this video. Even though some of these people already have the same exact phone, they have more programs running on them and the memory has become fragmented.
http://m.cnet.com/news/kimmel-fools-people-into-believing-iphone-4s-is-iphone-5/57512267
If your computer is really running your game at a minimum greater than 60fps then there should not be any shuddering or input lag with v-sync on.