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Question about Refresh Rate and G-Sync/Freesync - Page 2

post #11 of 28
Quote:
Originally Posted by myresolution_72 View Post

Tearing is eliminated if your fps is less than the refresh rate limitation of your monitor so what scenario will produce stuttering?

This is incorrect, and that's the reason you don't see the value in G-sync/Freesync.

You will get tearing anytime the GPU frame rate is not synced (i.e. by using vsync) to the monitor, whether that is higher or lower than the refresh rate. That's why G-sync/Freesync exist, because then you don't have to use vsync to synchronize the frame rate and the monitor refresh rate.
Edited by Forceman - 11/10/15 at 5:26pm
post #12 of 28
Thread Starter 
Quote:
Originally Posted by Forceman View Post

This is incorrect, and that's the reason you don't see the value in G-sync/Freesync.

You will get tearing anytime the GPU frame rate is not synced (i.e. by using vsync) to the monitor, whether that is higher or lower than the refresh rate. That's why G-sync/Freesync exist, because then you don't have to use vsync to synchronize the frame rate and the monitor refresh rate.

That makes sense. I wasn't aware tearing was possible when your FPS is lower than the refresh rate, in that case I can see the benefit of G-Sync/Freesync.
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post #13 of 28
Quote:
Originally Posted by myresolution_72 View Post

That makes sense. I wasn't aware tearing was possible when your FPS is lower than the refresh rate, in that case I can see the benefit of G-Sync/Freesync.

Yes, That's why I used the term "tearing / stuttering" at the same time, because they can happen one or the other tongue.gif. But I think we were just talking in the event of using a high end GPU, and producing much more of what the monitor can handle rolleyes.gif
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post #14 of 28
stuttering or studdering occurs more often when the GPU has to repeat or send an extra frame to match the fixed refresh rate of a 60Hz monitor when V-Sync is turned on.
 
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post #15 of 28
Thread Starter 
Quote:
Originally Posted by josepi View Post

Yes, That's why I used the term "tearing / stuttering" at the same time, because they can happen one or the other tongue.gif. But I think we were just talking in the event of using a high end GPU, and producing much more of what the monitor can handle rolleyes.gif

Yeah we were, haha. I was under the impression that when producing not enough frames, there was no negative effect.
Quote:
Originally Posted by Peter Nixeus View Post

stuttering or studdering occurs more often when the GPU has to repeat or send an extra frame to match the fixed refresh rate of a 60Hz monitor when V-Sync is turned on.

You learn something new everyday. I never knew that. I thought with V-Sync on it would cap out at 60 fps but if it was under 60 fps it would run as if V-Sync was off. Now I know when < 60 fps the GPU tries to pump extra frames to match 60 fps which causes stuttering.

By the way, I've been eyeballing a few Nixeus Freesync monitors now that I understand the benefit of Freesync. biggrin.gif
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post #16 of 28
Quote:
Originally Posted by Peter Nixeus View Post

stuttering or studdering occurs more often when the GPU has to repeat or send an extra frame to match the fixed refresh rate of a 60Hz monitor when V-Sync is turned on.

So... NVidia first came up with adaptive v-sync to turn off v-sync completely when your framerate falls below the refresh rate in order to improve input latency. Does that mean that you can get tearing again during the fall? If so, I suppose you'll only want to use adapative v-sync if you know you're going to be rendering above the refresh rate (all or most of the time.)
post #17 of 28
Quote:
Originally Posted by mouacyk View Post

So... NVidia first came up with adaptive v-sync to turn off v-sync completely when your framerate falls below the refresh rate in order to improve input latency. Does that mean that you can get tearing again during the fall? If so, I suppose you'll only want to use adapative v-sync if you know you're going to be rendering above the refresh rate (all or most of the time.)

There are two different things Nvidia calls adaptive Vsync.

The original adaptive vsync was implemented to get around the half-refresh rate problem of Vsync. With Vsync enabled, when your frame rate drops below the refresh rate, the effective refresh rate is halved - so if you are using 60 Hz Vsync and you are rendering 58 FPS, you are only going to be displaying 30 FPS. Adaptive Vsync (a control panel option) turned off vsync in that situation so you would be able to render the full 58 FPS, albeit with some tearing. The assumption being that tearing at 58 FPS is better than no tearing at 30 FPS.

Variable refresh rate (sometimes called Async), which is Gsync/Freesync, was designed as you said, to eliminate input lag and tearing associated with Vsync by syncing the monitor to the GPU instead of the GPU to the monitor. Gsync is basically Vsync that works at all refresh rates (within the supported range) instead if at just a single refresh rate.
Edited by Forceman - 11/11/15 at 8:11am
post #18 of 28
Thread Starter 
Quote:
Originally Posted by mouacyk View Post

So... NVidia first came up with adaptive v-sync to turn off v-sync completely when your framerate falls below the refresh rate in order to improve input latency. Does that mean that you can get tearing again during the fall? If so, I suppose you'll only want to use adapative v-sync if you know you're going to be rendering above the refresh rate (all or most of the time.)

I think when it drops below 30 fps it will possibly stutter since the monitor will bottom out at 30hz. Anything below a 30hz refresh rate is unstable unless you hack the monitor to lower the minimum refresh rate which could damage it. I could understand if tearing was visible when fps was higher than the monitors limit of 144hz which makes me wonder, do the drivers for G-Sync/Freesync limit the GPUs fps to 144 to cap out the monitors 144hz or do you need to enable V-Sync when you're producing over 144 fps in a game? In that case, with V-Sync enabled, will that present stuttering if the V-Sync locked at 144hz and you're producing less than that?
Quote:
Originally Posted by Forceman View Post

There are two different things Nvidia calls adaptive Vsync.

The original adaptive vsync was implemented to get around the half-refresh rate problem of Vsync. With Vsync enabled, when your frame rate drops below the refresh rate, the effective refresh rate is halved - so if you are using 60 Hz Vsync and you are rendering 58 FPS, you are only going to be displaying 30 FPS. Adaptive Vsync (a control panel option) turned off vsync in that situation so you would be able to render the full 58 FPS, albeit with some tearing. The assumption being that tearing at 58 FPS is better than no tearing at 30 FPS.

Async, which is Gsync/Freesync, was designed as you said, to eliminate input lag and tearing associated with Vsync by syncing the monitor to the GPU instead of the GPU to the monitor. Gsync is basically Vsync that works at all refresh rates (within the supported range) instead if at just a single refresh rate.

Does AMD have adaptive V-Sync like nVidia does? I read that it's RadeonPro but someone said development for it was stopped.
Edited by myresolution_72 - 11/11/15 at 8:09am
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post #19 of 28
Pretty sure both company's drivers cap the frame rates at the maximum supported refresh rate now - originally I think Nvidia did not.

I don't think AMD ever developed adaptive Vsync, at least not officially.
Edited by Forceman - 11/11/15 at 8:12am
post #20 of 28
Thread Starter 
Quote:
Originally Posted by Forceman View Post

Pretty sure both company's drivers cap the frame rates at the maximum supported refresh rate now - originally I think Nvidia did not.

Capping the frame rate is essentially enabling V-Sync, so would this present the input lag and other cons of V-Sync only when at a consistent 144 fps on a G-Sync/Freesync monitor?
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