Not sure where you have got the idea that AMD came up with G-sync first?
This is possibly the article that has led rise to the belief that David Nalasco came up with the idea of G-sync
http://techreport.com/blog/25542/a-few-thoughts-on-nvidia-g-sync
Anyway here is the original very interesting old article mentioned above about frame metering and vsync issues with relation to SLI/crossfire stuttering and other multi GPU usage, with AMD's David Nalasco and Nvidia's Tom Petersen. goes to show that both companies have been looking at this syncing issue for many years, Nvidia have even had hardware in their GPU's since the g80 to do with frame metering.
http://techreport.com/review/21516/inside-the-second-a-new-look-at-game-benchmarking/11
Pages 11 and 12 are well worth reading if this subject (G-sync) interests you at all.
This is possibly the article that has led rise to the belief that David Nalasco came up with the idea of G-sync
http://techreport.com/blog/25542/a-few-thoughts-on-nvidia-g-sync
You may remember that I touched on the possibility of a smarter vsync on this page of my original Inside the Second article. In fact, AMD's David Nalasco was the one who floated the idea.
Anyway here is the original very interesting old article mentioned above about frame metering and vsync issues with relation to SLI/crossfire stuttering and other multi GPU usage, with AMD's David Nalasco and Nvidia's Tom Petersen. goes to show that both companies have been looking at this syncing issue for many years, Nvidia have even had hardware in their GPU's since the g80 to do with frame metering.
http://techreport.com/review/21516/inside-the-second-a-new-look-at-game-benchmarking/11
Pages 11 and 12 are well worth reading if this subject (G-sync) interests you at all.