What is the difference between Gsync and Vsync?

[Billy Pilgrim]

What is the difference between Gsync and Vsync?

[Max746]

Gsync is for Nvidia GPUs and Vsync is for AMD GPUs. you cant mix and match but Gsync is a hell of a lot more expensive 

[laushik]

Just now, Max746 said:

Gsync is for Nvidia GPUs and Vsync is for AMD GPUs. you cant mix and match but Gsync is a hell of a lot more expensive 

Actually, freesync is for AMD GPU'S. 

[Max746]

shit yeah my bad. ok Vsync is vertical sync to prevent screen tearing

[Mira Yurizaki]

On 11/23/2018 at 1:12 PM, Billy Pilgrim said:

What is the difference between Gsync and Vsync?

By default the monitor determines the refresh rate. It says, for example, "I will only draw on the screen 60 times a second" The problem is that the GPU doesn't always render frames at this rate or something that divides into it, like 30 or 15. The GPU doesn't care that the monitor is reading the output. So when the GPU makes a new frame, it just swaps it out and the monitor is now reading the new frame's data. This is called tearing, because usually it results in a image that looks like you took two frames, cut them up, and pasted them together.

 

VSync forces the GPU to wait until the monitor is done reading the entire frame before making this swap. The problem is this means the frame that the monitor reads is late for some amount of time which causes input lag.

 

With GSync on the other hand, the GPU tells the monitor "you're going to draw when I have something done." Though this only happens if the GPU is rendering at a rate below the refresh rate. So, assuming a 60Hz refresh rate, GSync kicks on at say 30 or 40 FPS, but not at 60 or higher FPS.

 

tl;dr

• Vsync: The monitor tells the GPU to wait until its done reading the frame data before the GPU can push out a new frame
• GSync: The GPU tells the monitor to update only when a new frame is available as long as the frame rate is below the refresh rate

[Mira Yurizaki]

Oh, and to add to my post: G-Sync only works on monitors specifically with a G-Sync module. It's not something that works on any given monitor.

Edited December 6, 2018 by M.Yurizaki

[Billy Pilgrim]

41 minutes ago, M.Yurizaki said:

• Vsync: The monitor tells the GPU to wait until its done reading the frame data before the GPU can push out a new frame
• GSync: The GPU tells the monitor to update only when a new frame is available as long as the frame rate is below the refresh rate

So if you were looking at two otherwise identical monitors side by side, one using Gsync the other using Vsync what would you see?

[Mira Yurizaki]

Just now, Billy Pilgrim said:

So if you were looking at two otherwise identical monitors side by side, one using Gsync the other using Vsync what would you see?

It depends. If it's a 60Hz monitor and the PC is running a game between 35 and 50 FPS, the GSync monitor would appear smoother because it can display those frames without tearing whereas the VSync one would cap it at 30 FPS because the GPU is missing the 1/60th second window and so it has to do it on every other.

[Billy Pilgrim]

Just now, M.Yurizaki said:

It depends. If it's a 60Hz monitor and the PC is running a game between 35 and 50 FPS, the GSync monitor would appear smoother because it can display those frames without tearing whereas the VSync one would cap it at 30 FPS because the GPU is missing the 1/60th second window and so it has to do it on every other.

Ok, thanks

[Mira Yurizaki]

Just now, Billy Pilgrim said:

Ok, thanks

I forgot another scenario. If the PC can run the game at 60 FPS but the FPS drops even just a bit, it'll be way more noticeable on the VSync monitor because it drops to 30FPS.

[Princess Luna]

On 11/23/2018 at 7:12 PM, Billy Pilgrim said:

What is the difference between Gsync and Vsync?

Amazing how none of the well known tech youtubers have ever really made specifically comparison to the technologies, all we have are individual explanations on each.

 

any ways: