Again,
I'll point out some fundamentals for people.
A gpu without vsync enabled sends the frame as soon as it's ready to the monitor. Nvidia gpu's using gsync are running in the same mode GPU's have been capable of since gpu's were first being made.
Hardware side, there is nothing on the gpu required, at all, full stop.
Monitor side, very simple again, you have a buffer for the screen to read and display, you have a timing program and you have a control program that says "update every 8/16/32/whatever milliseconds" depending on what mode you're in. Monitor side you need software to say, don't update every X ms, update when the buffer is refilled...........
and there we have G-sync, it's simplicity is rather impressive actually, and the fact it hasn't been done till now is hilarious. I've made many posts about how an industry does things not because they should, but because they used to do it so they do now. Refresh on lcd's has essentially always been down to the fact that old monitors used refresh rates....... and no one bothered to change it. Same way 4k screens have all kinds of odd connection methods and crap refresh rates...... because you couldn't get the industry giants in a room to agree on a standard(AMD stepped up, wrote a standard and gave it to Vesa to use fairly recently, so we should have 120hz/display port/one cable as a 4k standard amongst most screens in the future).
G-sync, is Nvidia only enabling g-sync to work on screens they deem to have paid them enough to enable it. It's also the chip on the monitor, Nvidia decided to enable g-sync mode they require an Nvidia monitor controller, and their own software, and will disable any Nvidia users not using the right screen/monitor controller.
There is NOTHING, at all, even possible that Nvidia can do to stop every single other monitor chip being updated to include a "g-sync" like mode, nothing. It may need updated asic's, it may be doable in firmware on some chips, not on others, who knows really. The actual application is ludicrously simple.
Think of g-sync like the mode that all screens have had the potential for since LCD's started, and no one thought to enable... because they are stupid. Then think of Nvidia's g-sync like anything else they do, insisting their own customers pay 3 times the actual prices for the privilege of not having the option locked out by nvidia drivers.
The only thing Nvidia can patent is their driver code, and the actual physical chip they make, they can in no way prevent monitor controllers having the same mode added, and as said, gpu hardware side, the hardware has been compatible since day 1 of gpu's being available.
