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RTings Tests Close to 60 Monitors for GSync Compatible VRR

Posted: Tue Jan 22, 2019 1:40 pm
by Voldenuit
https://www.rtings.com/monitor/tests/motion/g-sync-compatible

For your reading pleasure. Useful resource to check if a monitor works well in GSync Compatible mode.

Interestingly, they had issues with screen tearing on all their monitors, even when testing Freesync with Radeon cards.

On all monitors, the screen would usually start tearing within 1-2 fps of the monitor's maximum refresh rate. The exact same behavior was observed when testing the monitors on an AMD Radeon card, and is caused by the refresh rate very briefly exceeding the display's maximum refresh rate.


I've not noticed this on any of my GSync displays, even when using ULMB, and definitely not when using GSync. It's also something I haven't seen mentioned in monitor reviews, so would be curious to know what that's about.

EDIT: Notably, they only tested VRR using the Pendulum demo, so what they're seeing may not be representative of actual game performance.

Re: RTings Tests Close to 60 Monitors for GSync Compatible VRR

Posted: Tue Jan 22, 2019 1:58 pm
by Airmantharp
At the very least, it's nice to know that Nvidia's move to support Adaptive Sync over DisplayPort won't make these FreeSync monitors suck any more than they already do ;)

Re: RTings Tests Close to 60 Monitors for GSync Compatible VRR

Posted: Wed Jan 23, 2019 7:27 am
by Topinio
Lol, I have never seen screen tearing (or any issues) on my BenQ XL2730Z.

FreeSync is great, though adding it as a feature it doesn't stop sucky monitors from sucking.

Re: RTings Tests Close to 60 Monitors for GSync Compatible VRR

Posted: Wed Jan 23, 2019 7:37 am
by Kretschmer
I've always read that you should cap your refresh rate a few Hz below a FreeSync monitor's maximum FreeSync Hz. This is a known issue.

Re: RTings Tests Close to 60 Monitors for GSync Compatible VRR

Posted: Wed Jan 23, 2019 9:20 am
by Topinio
Kretschmer wrote:
I've always read that you should cap your refresh rate a few Hz below a FreeSync monitor's maximum FreeSync Hz. This is a known issue.

sauce?

I never heard of that.

Re: RTings Tests Close to 60 Monitors for GSync Compatible VRR

Posted: Wed Jan 23, 2019 9:25 am
by DancinJack
I mean obviously these are anecdotal, but they're there.

https://community.amd.com/thread/223079
https://www.reddit.com/r/Amd/comments/7 ... ync_is_on/ (not the OP, but comments below cite the same thing)

Re: RTings Tests Close to 60 Monitors for GSync Compatible VRR

Posted: Wed Jan 23, 2019 9:44 am
by Krogoth
Topinio wrote:
Kretschmer wrote:
I've always read that you should cap your refresh rate a few Hz below a FreeSync monitor's maximum FreeSync Hz. This is a known issue.

sauce?

I never heard of that.


I can confirm this first-hand. It is actually an issue with VESA's adaptive sync in general. What is actually happening is that monitor is switching between out of range into adaptive range. It takes a fraction of second for the monitor to adjust but it is noticeable (tearing, shuddering) with rapid screen panning and motion on the screen. That's why you should should cap the framerate within the monitor's adaptive range. G-Sync 1.0 masks this problem within its proprietary module so the monitor never has to directly adjust. Thank goodness that both Nvidia and AMD RTG's current driver suite allow framerate ceiling and floor on the fly.

Re: RTings Tests Close to 60 Monitors for GSync Compatible VRR

Posted: Wed Jan 23, 2019 9:56 am
by Topinio
Well, that's a pretty stupid flaw. Oof.

Re: RTings Tests Close to 60 Monitors for GSync Compatible VRR

Posted: Wed Jan 23, 2019 9:59 am
by specialworks
Useful summary, much appreciated by this lurker. Concise and clear and appropriately classy for the TechReport Forum... :D

Krogoth wrote:
Topinio wrote:
Kretschmer wrote:
I've always read that you should cap your refresh rate a few Hz below a FreeSync monitor's maximum FreeSync Hz. This is a known issue.

sauce?

I never heard of that.


I can confirm this first-hand. It is actually an issue with VESA's adaptive sync in general. What is actually happening is that monitor is switching between out of range into adaptive range. It takes a fraction of second for the monitor to adjust but it is noticeable (tearing, shuddering) with rapid screen panning and motion on the screen. That's why you should should cap the framerate within the monitor's adaptive range. G-Sync 1.0 masks this problem within its proprietary module so the monitor never has to directly adjust. Thank goodness that both Nvidia and AMD RTG's current driver suite allow framerate ceiling and floor on the fly.

Re: RTings Tests Close to 60 Monitors for GSync Compatible VRR

Posted: Wed Jan 23, 2019 10:36 am
by Krogoth
Topinio wrote:
Well, that's a pretty stupid flaw. Oof.


It is very minor problem that only happens if your GPU's performance threshold is going back and forth between out of range into adaptive range. If your GPU is consistently pumps a framerate that is far beyond the adaptive range or is unable to reach it. You'll never see in action. I just happened to come across this problem when fiddling around adaptive syncing with my RX Vega 64 and MG278 setup on some games/settings.

Re: RTings Tests Close to 60 Monitors for GSync Compatible VRR

Posted: Wed Jan 23, 2019 1:53 pm
by Topinio
Krogoth wrote:
It is very minor problem that only happens if your GPU's performance threshold is going back and forth between out of range into adaptive range. If your GPU is consistently pumps a framerate that is far beyond the adaptive range or is unable to reach it. You'll never see in action. I just happened to come across this problem when fiddling around adaptive syncing with my RX Vega 64 and MG278 setup on some games/settings.

I guess that's why it got missed, there aren't many times that the settings won't put the framerate always below or always above the limit. Put like that, can almost give them a pass.

Re: RTings Tests Close to 60 Monitors for GSync Compatible VRR

Posted: Sun Jan 27, 2019 10:49 pm
by CScottG
Wendell tests some Korean monitors (and Pixio):

https://www.youtube.com/watch?v=tB5BEXjvocw