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dgrdsv

Member
Oct 25, 2017
11,887
What I generally suggest is that people set a global FPS limit in RTSS that is 3 FPS lower than the monitor's maximum refresh rate
This is a rather bad suggestion considering that limiting the desktop below the refresh rate may lead to lots of issues with programs which are using the GPU - like Web browsers or emulation software (DOSBox for example).
The best option is to setup separately for each title you're playing right now.
 

Pargon

Member
Oct 27, 2017
12,037
This is a rather bad suggestion considering that limiting the desktop below the refresh rate may lead to lots of issues with programs which are using the GPU - like Web browsers or emulation software (DOSBox for example).
The best option is to setup separately for each title you're playing right now.
You can set up exclusions for your browser or emulators.
Setting it up as a blacklist instead of whitelisting every game that you run is generally going to require far fewer rules.
My personal preference is to only whitelist games I want to use it with, but as a general recommendation, I'd suggest the option that is typically "set and forget".
 

Sky87

Member
Oct 27, 2017
3,865
So i noticed there's a slight bug with my XB271HU which seem to be common on GSync screens (the XB271HU and the PG279Q for example).

https://rog.asus.com/forum/showthread.php?92745-PG278QR-Vertical-Line-Issue
https://forums.geforce.com/default/...-glitch-on-side-of-screen-with-gsync-monitor/
https://community.acer.com/en/discussion/418751/line-down-the-middle-overlapping-image

Not a major issue if turning the screen off/on solves it, but i'm hoping it won't become a permanent issue (according to their customer service there are no ''long term complications'')

Acer Community Manager
Re: Line down the middle, overlapping image
April

All,

We have identified the issue that can cause the middle of the display to be offset occasionally and we can correct this. It will require a firmware update performed by our service center, but I have been informed that there are no long term complications if you decide not to have this issue addressed. The firmware update is currently scheduled to be available in the later part of May. I will confirm in this thread when it is available and our support staff is trained on the subject.

I apologize for the inconvenience this issue has caused and that we're not able to provide a solution that you can apply yourself however our support teams will available to help take care of the arrangements of getting your monitor serviced.

It's weird though as this was posted on their forum back in April 2016 and my screen had a June 2017 date on the packaging i received (bought a refurbished one). Just posting in case others have noticed the same and wondered what it came from.
 

dgrdsv

Member
Oct 25, 2017
11,887
RTSS affects the desktop? I didn't know that.
Desktop itself is blacklisted I think but all programs you may use aren't and a global fps limit will affect them if they use GPU for rendering in any way. I ran into this myself not so long ago when using DOSBox with OpenGL renderer.
 
OP
OP
Vipu

Vipu

Banned
Oct 26, 2017
2,276
Ok, what about desktop then?

Desktop itself is blacklisted I think but all programs you may use aren't and a global fps limit will affect them if they use GPU for rendering in any way. I ran into this myself not so long ago when using DOSBox with OpenGL renderer.

Oh I think I get it now, so some random program can use GPU and lets say if I have OC profile for GPU in MSI AB it can trigger the OC to turn on because its counted as 3D program?
 

Mochi

Avenger
Oct 25, 2017
1,704
Seattle
Is there a go-to g sync monitor these days? If I remember correctly q1 2018 will see the release of some pretty kickass ones, but I'm not on the up and up.
 

dgrdsv

Member
Oct 25, 2017
11,887
Oh I think I get it now, so some random program can use GPU and lets say if I have OC profile for GPU in MSI AB it can trigger the OC to turn on because its counted as 3D program?
Well, yeah, but this isn't anything to be worried about as the driver would do the same thing without any AB profile setup anyway (via GPU Boost). I was talking specifically about frame limiting which may introduce some nasty artifacts in programs which while using GPU for rendering are not really games (browsers, photo viewers / editor, video players, etc.)
 
Oct 25, 2017
4,184
Sacramento
It's weird though as this was posted on their forum back in April 2016 and my screen had a June 2017 date on the packaging i received (bought a refurbished one). Just posting in case others have noticed the same and wondered what it came from.

I have had this issue crop up on my Dell in different games, I'll try to remember to edit this post if it crops up again. It's a really weird bug
 

Sky87

Member
Oct 27, 2017
3,865
Was there a bug with win 10 creators update and gsync?
Not GSync specifically, but the Game Bar seems to mess up with some games. Battlefront 2 is an example:

https://answers.ea.com/t5/Technical...ve-resolution-w-Full-Screen/m-p/6447532#M3198

To fully disable the Game Bar stuff, check the ''How to do it'' part in here:

https://www.reddit.com/r/Overwatch/comments/6sdn4s/if_you_play_overwatch_on_windows_10_consider/

When doing that, you don't have to disable fullscreen optimization on a per game basis as it's (apparently) fully disabled.
 

Lime

Banned for use of an alt account
Banned
Oct 25, 2017
1,266
Anyone know how to get G-Sync working on Wolfenstein 2? I get crazy screen tearing.
 

Pargon

Member
Oct 27, 2017
12,037
Anyone know how to get G-Sync working on Wolfenstein 2? I get crazy screen tearing.
You shouldn't have to do anything special to get it working.
Make sure you've followed the instructions outlined at the beginning of this topic to get things set up correctly.
You may need to have G-Sync set for Fullscreen+Windowed rather than only Fullscreen mode.
When doing that, you don't have to disable fullscreen optimization on a per game basis as it's (apparently) fully disabled.
Fullscreen Optimizations generally benefit G-Sync in my experience, since it operates in Fullscreen mode rather than Windowed mode, but you get the fast switching as if it were operating in Borderless mode.
 

Premium Ghoul

Member
Oct 27, 2017
1,359
Australia
I am still having consistent issues with borderless and windowed games and G-sync. Before the Creators Update I'd played hundreds of hours of games in borderless mode (forced or native) and I'd only experienced the 24fps lock bug, which was fixed completely by disabling fast startup.

When the Creators Update came out I immediately started having this problem (this is my video):


It was repeatable and to get around it I just started playing every game in exclusive fullscreen mode, which isn't my favourite but I just did it to ensure that G-sync would function properly. I could also avoid it by simply not having anything on my second monitor while playing a borderless game.

Now with more recent Windows updates I'm faced with an even worse problem. I've made another video here showing what currently happens in all borderless games for me, regardless of what's happening on my other screen:


Games can run perfectly smooth in borderless mode, but it seems like loading screens and other transitions will introduce persistent stuttering that totally ruins the experience. Sometimes the stutter will go away on it's own, sometimes I can get rid of it by toggling fullscreen and borderless modes, sometimes I have to alt+tab and click on the desktop to make it go away. More often than not the stuttering will just be so present that it's simply not worth playing games in borderless mode.

This brings me to another layer of the problem: Shadow Bug (the game in my second video) is a Unity 4 game and thus, does not support exclusive fullscreen mode, forced or otherwise. There are several games these days that only offer borderless as their 'fullscreen' mode and I am having a real hard time playing them with this issue.

I just did a clean install of the latest Nvidia GPU drivers (Ran DDU in safe mode, etc.) and I'm still having the same problem. It also occurs whether 'disable fullscreen optimisations' is checked or not.
 

Pargon

Member
Oct 27, 2017
12,037
Now with more recent Windows updates I'm faced with an even worse problem. I've made another video here showing what currently happens in all borderless games for me, regardless of what's happening on my other screen:


Games can run perfectly smooth in borderless mode, but it seems like loading screens and other transitions will introduce persistent stuttering that totally ruins the experience. Sometimes the stutter will go away on it's own, sometimes I can get rid of it by toggling fullscreen and borderless modes, sometimes I have to alt+tab and click on the desktop to make it go away. More often than not the stuttering will just be so present that it's simply not worth playing games in borderless mode.

This brings me to another layer of the problem: Shadow Bug (the game in my second video) is a Unity 4 game and thus, does not support exclusive fullscreen mode, forced or otherwise. There are several games these days that only offer borderless as their 'fullscreen' mode and I am having a real hard time playing them with this issue.

I just did a clean install of the latest Nvidia GPU drivers (Ran DDU in safe mode, etc.) and I'm still having the same problem. It also occurs whether 'disable fullscreen optimisations' is checked or not.

I don't know anything about the first issue, as I don't use a dual-monitor setup.
The second is definitely a problem that was introduced with the Fall Creators Update, but I've only seen it in Life is Strange: Before the Storm, and Stardew Valley. As you say, it doesn't seem to be affected by Fullscreen Optimizations.
I run everything in borderless mode where possible (including via Borderless Gaming or other tweaks) and those are the only two that I've seen affected by this.
I'd suggest that you report it to Microsoft and submit a trace along with it via the Windows Feedback Hub.

I wonder: do you use the virtual desktops feature at all?
I've noticed that, in Stardew Valley at least, alt-tabbing away from it to something else and back does not always fix the problem, but switching to another virtual desktop and back nearly always does.

In LiS:BtS, I've also noticed the same behavior of level loads triggering it - though not always. Alt-tabbing away and back for a second fixes it.
That seems like it could be something specific to Unity, and possibly only certain versions of it. Stardew Valley never triggers it again during gameplay.
 

Knurek

Member
Oct 26, 2017
4,336
Now with more recent Windows updates I'm faced with an even worse problem. I've made another video here showing what currently happens in all borderless games for me, regardless of what's happening on my other screen:


Have you tried using SpecialK to force presentation mode (Direct3D11 Settings->SwapChain Managements->Use Flip Presentation Mode, then restart the game).
Helped me with Hollow Knight and other Unity titles.
 
OP
OP
Vipu

Vipu

Banned
Oct 26, 2017
2,276
I got that first problem always with multimonitors, dunno why and how to fix it.
 

Premium Ghoul

Member
Oct 27, 2017
1,359
Australia
The second is definitely a problem that was introduced with the Fall Creators Update, but I've only seen it in Life is Strange: Before the Storm, and Stardew Valley. As you say, it doesn't seem to be affected by Fullscreen Optimizations.
I run everything in borderless mode where possible (including via Borderless Gaming or other tweaks) and those are the only two that I've seen affected by this.
I'd suggest that you report it to Microsoft and submit a trace along with it via the Windows Feedback Hub.

I wonder: do you use the virtual desktops feature at all?
I've noticed that, in Stardew Valley at least, alt-tabbing away from it to something else and back does not always fix the problem, but switching to another virtual desktop and back nearly always does.

In LiS:BtS, I've also noticed the same behavior of level loads triggering it - though not always. Alt-tabbing away and back for a second fixes it.
That seems like it could be something specific to Unity, and possibly only certain versions of it. Stardew Valley never triggers it again during gameplay.

I'll make sure I send a report along to Microsoft. I don't use virtual desktops.

In my experience a game can run fine until I alt+tab, then the performance will be all over the place and it seems unfixable without switching to exclusive fullscreen.

I've started going through all the games I have installed and seeing which ones stutter and which ones don't. So far every Unity Engine game has stuttered whether it was using Unity 4 or 5, and all of these games were completely stutter free:
- Overwatch
- Hitman
- Rocket League
- Wolfenstein 2

Dark Souls 2 and 3 however both had stuttering like the Unity engine games did.

Have you tried using SpecialK to force presentation mode (Direct3D11 Settings->SwapChain Managements->Use Flip Presentation Mode, then restart the game).
Helped me with Hollow Knight and other Unity titles.

I don't have much experience with SpecialK. I always assumed it was only for specific games like Nier or Deus Ex Mankind Divided. Is there a generic one that I can use with all games?
 

Akumasama

Member
Nov 8, 2017
542
Italy
Not sure if OT, but hoping someone will have cool information for me in this thread.
Anybody knows why a nice display like Samsung C49HG90 only comes out in FreeSync version?
Does anybody know if there will ever be a Gsync version?

Thanks!
 
OP
OP
Vipu

Vipu

Banned
Oct 26, 2017
2,276
Not sure if OT, but hoping someone will have cool information for me in this thread.
Anybody knows why a nice display like Samsung C49HG90 only comes out in FreeSync version?
Does anybody know if there will ever be a Gsync version?

Thanks!

Because only AMD have the graphic power to run that screen. /s
 

Knurek

Member
Oct 26, 2017
4,336
I don't have much experience with SpecialK. I always assumed it was only for specific games like Nier or Deus Ex Mankind Divided. Is there a generic one that I can use with all games?
SpecialK is the generic one. Should work either through local injection (place correctly named dll in the game folder) or through SKIM global injector (provided you play Steam games). You might have to disable RTSS, as they tend to not play nicely together.
 

Custódio

Member
Oct 25, 2017
1,902
Brazil, Unaí/MG
I am still having consistent issues with borderless and windowed games and G-sync. Before the Creators Update I'd played hundreds of hours of games in borderless mode (forced or native) and I'd only experienced the 24fps lock bug, which was fixed completely by disabling fast startup.

When the Creators Update came out I immediately started having this problem (this is my video):


It was repeatable and to get around it I just started playing every game in exclusive fullscreen mode, which isn't my favourite but I just did it to ensure that G-sync would function properly. I could also avoid it by simply not having anything on my second monitor while playing a borderless game.

Now with more recent Windows updates I'm faced with an even worse problem. I've made another video here showing what currently happens in all borderless games for me, regardless of what's happening on my other screen:


Games can run perfectly smooth in borderless mode, but it seems like loading screens and other transitions will introduce persistent stuttering that totally ruins the experience. Sometimes the stutter will go away on it's own, sometimes I can get rid of it by toggling fullscreen and borderless modes, sometimes I have to alt+tab and click on the desktop to make it go away. More often than not the stuttering will just be so present that it's simply not worth playing games in borderless mode.

This brings me to another layer of the problem: Shadow Bug (the game in my second video) is a Unity 4 game and thus, does not support exclusive fullscreen mode, forced or otherwise. There are several games these days that only offer borderless as their 'fullscreen' mode and I am having a real hard time playing them with this issue.

I just did a clean install of the latest Nvidia GPU drivers (Ran DDU in safe mode, etc.) and I'm still having the same problem. It also occurs whether 'disable fullscreen optimisations' is checked or not.


I also have this loading/transition problem in games like Skyrim Special Edition and Hollow Knight.
 

Praetorpwj

Member
Nov 21, 2017
4,364
I was thinking of jumping for an Acer Predator Z35 Ultrawide; any evidence that the QC is better for this model than previous Acer/Asus ultrawide efforts?
 

Premium Ghoul

Member
Oct 27, 2017
1,359
Australia
SpecialK is the generic one. Should work either through local injection (place correctly named dll in the game folder) or through SKIM global injector (provided you play Steam games). You might have to disable RTSS, as they tend to not play nicely together.
Seems like that does fix at least one Unity engine game (Shadow Bug) so thanks for that, but I haven't had any luck getting it to work properly even with other Unity games. Once I've changed the flip presentation mode games appear to launch in a broken state (black screen with audio) and non-Unity games seem to not want to launch at all while SpecialK is running.

I've quit Afterburner and the only other thing I have running the background is the Geforce Experience program.
 

Knurek

Member
Oct 26, 2017
4,336
Seems like that does fix at least one Unity engine game (Shadow Bug) so thanks for that, but I haven't had any luck getting it to work properly even with other Unity games. Once I've changed the flip presentation mode games appear to launch in a broken state (black screen with audio) and non-Unity games seem to not want to launch at all while SpecialK is running.
Other Unity titles may need for you to disable tecture cache. And it doesn't work for all titles, that's true - I couldn't get it to run with Draw Puzzle. Also make sure to use correct dll (d3d9 for D3D9, dxgi for D3D11). If you have further issues, there's a Steam discussion group where Kaldaien posts.
 

DickHams

Banned
Oct 28, 2017
416
Got a PG278QR during Black Friday one of the best decisions I've ever made! I'm loving G-sync I can't imagine life without it now.

Did the same. I was coming from an AOC 24" 1080p Gsync, and I'm still floored by how fantastic it is. I'm also impressed with how accurate the colours are right out of the box. Only thing I did was change gamma to 2.5 because everything looked a bit washed out, but that's likely related to the angle I sit at anyway.

Also, I was having flickering issues at the desktop when running my AOC with a secondary 60hz monitor. Those problems are gone with the PG278QR. Not sure if it was the displayport cable giving me issues or the monitor itself, but I couldn't be happier.
 

Dylan

Member
Oct 28, 2017
3,260
Just ordered this baby.
Happy to join the G-sync club.
And yes, I already know I will enjoy it, I tried it in the past and I longed to get one for months at this point.

9evz3_s-200x150.gif

Welcome!

I really feel like G-Sync is one of those things you can't ever go back from. It's like SD to HD. You just kind of get used to it because it makes you forget that tearing was ever thing you had to deal with. When I see it elsewhere I get the "oh yeah I remember that" feeling. Good times.
 

Teiresias

Member
Oct 27, 2017
8,229
[EDIT] Nevermind, weirdly I left the monitor sitting for about twenty minutes, went back and now they're gone. I know they were on the monitor and not the GPU because I'd switched to the unused HDMI input and they were still there. Hmmm, going to keep an eye on it I suppose.

Soooooo . . . does anyone have any experience dealing with Asus warranties?

I turned on my desktop PC for the first time in a couple of weeks and install the latest Nvidia driver. I have an Asus PG348Q When the screen went black I realized that my monitor now spontaneously has three stuck pixels (so they're white when a black background is present) that were not there before (my screen has been fine for a year aside from normal IPS glow). One is in the lower half on the left, and one is in the lower half and one slightly to the right and in the upper half in the center third of the screen. I know for a fact these were not here before, so I'm wondering if I'm going to be SOL trying to do a warranty claim for this. I'm unclear whether the PG348Q falls under Asus's ZBD warranty or not.
 
Last edited:
Oct 27, 2017
187
I bought Deus Ex: MD on sale. I thought the stuttering I was getting was g-sync related, but I've tried enabling v-sync globally in the nvidia control panel and limiting the framerate with both RTSS and Nvidia Inspector (separately, not at the same time) and it still stuttered in the benchmark. I haven't tried playing the game yet. This is only the second current-gen game I've tried on this new laptop after the Witness and it's very noticeable. Lots of people mention "stutter" on the discussion forums, so now I think it's just an issue with the game.
 

Stitches

Member
Oct 27, 2017
524
Cleveland
Question for you gsync owners: would you recommend investing in a new GPU or a g-sync monitor? I'm currently sitting with a 970 and a 144hz g-sync sounds appealing, but would I be better to wait for the new series of GeForce (or just buy 1070)?
 

Okii

Banned
Oct 25, 2017
3,189
Question for you gsync owners: would you recommend investing in a new GPU or a g-sync monitor? I'm currently sitting with a 970 and a 144hz g-sync sounds appealing, but would I be better to wait for the new series of GeForce (or just buy 1070)?

Get a monitor, wait for the next GPU architecture, you'll get way more advantage now out of a nice monitor and the jump between a 970 to a 1070 isn't big enough in my opinion.
 
Oct 31, 2017
8,466
Question for you gsync owners: would you recommend investing in a new GPU or a g-sync monitor? I'm currently sitting with a 970 and a 144hz g-sync sounds appealing, but would I be better to wait for the new series of GeForce (or just buy 1070)?
I'd say take a monitor, too.
But I warn you: trying it WILL make you want a better GPU as soon as possible, because when you can hit 100+ fps (or even better 144/165) it feels like magic.
 
Nov 8, 2017
13,129
I have a 1080p AOC G-sync display that did me pretty well, but I've currently retired it now that I'm using the PC in the living room. Still, at some point I'm thinking I might jump on board for one of the crazy high refresh rate 4k HDR displays that got announced in Jan this year.

At 4k, high refresh rate seems unlikely even on high end hardware, but has anybody experimented with doing some kind of global half-refresh rate? Like 72hz 4k or something like that? I was not even slightly fussed going down from ~100hz to 60, so I think 72hz would be pretty much fine for me as the upper bound. At that point I'd almost rather stress my GPU less, even if I could go higher.
 

Lashley

<<Tag Here>>
Member
Oct 25, 2017
60,075
Question for you gsync owners: would you recommend investing in a new GPU or a g-sync monitor? I'm currently sitting with a 970 and a 144hz g-sync sounds appealing, but would I be better to wait for the new series of GeForce (or just buy 1070)?
I have a 970 and I never notice fps drops thanks to gsync, I'd honestly recommend it

I'll upgrade when the new GPUs hit
 

Pargon

Member
Oct 27, 2017
12,037
I bought Deus Ex: MD on sale. I thought the stuttering I was getting was g-sync related, but I've tried enabling v-sync globally in the nvidia control panel and limiting the framerate with both RTSS and Nvidia Inspector (separately, not at the same time) and it still stuttered in the benchmark. I haven't tried playing the game yet. This is only the second current-gen game I've tried on this new laptop after the Witness and it's very noticeable. Lots of people mention "stutter" on the discussion forums, so now I think it's just an issue with the game.
There are a few potential issues here:
Firstly, Deus Ex: Mankind Divided is a very CPU-heavy game.
If the cause of the stuttering is due to CPU load, G-Sync can't fix that. CPU-limited games often have very "spiky" frame-time graphs, while GPU-limited games tend to have nice smooth frame-time graphs.
You may want to try toggling Windows 10's Game Mode on or off and see which runs better. For my system with an R7-1700X, enabling Game Mode gives better minimum framerate numbers, but introduces stuttering. It may be the other way around for a mobile CPU.

Secondly, make sure that you are using the DX11 renderer.
The DX12 renderer performs worse and is more prone to stuttering. Frame-times measure much worse in DX12 for me.

Thirdly, I noticed that sometimes G-Sync was not active when the game was running in borderless mode.
It seemed like it may be linked to starting the game via the launcher, rather than using the -benchmark launch command to skip it and the intro videos.
When that happened, I had to alt-tab away from the game and back to it for G-Sync to activate. (just once I got to the menus for the first time)

Testing the benchmark on my system; an R7-1700X with a GTX 1070 on a PG348Q, it was actually running perfectly smoothly for me, which was not the case back when I built this system at the beginning of April. The game heavily favors Intel CPUs, and I was very disappointed in its performance back then because I couldn't get it to run smoothly.
A lot has changed since then, so I can't point at any one thing which may have fixed it; AMD updates, NVIDIA drivers, Windows 10 FCU improvements etc. Make sure your OS and drivers are up to date.
 

Lashley

<<Tag Here>>
Member
Oct 25, 2017
60,075
There are a few potential issues here:
Firstly, Deus Ex: Mankind Divided is a very CPU-heavy game.
If the cause of the stuttering is due to CPU load, G-Sync can't fix that. CPU-limited games often have very "spiky" frame-time graphs, while GPU-limited games tend to have nice smooth frame-time graphs.
You may want to try toggling Windows 10's Game Mode on or off and see which runs better. For my system with an R7-1700X, enabling Game Mode gives better minimum framerate numbers, but introduces stuttering. It may be the other way around for a mobile CPU.

Secondly, make sure that you are using the DX11 renderer.
The DX12 renderer performs worse and is more prone to stuttering. Frame-times measure much worse in DX12 for me.

Thirdly, I noticed that sometimes G-Sync was not active when the game was running in borderless mode.
It seemed like it may be linked to starting the game via the launcher, rather than using the -benchmark launch command to skip it and the intro videos.
When that happened, I had to alt-tab away from the game and back to it for G-Sync to activate. (just once I got to the menus for the first time)

Testing the benchmark on my system; an R7-1700X with a GTX 1070 on a PG348Q, it was actually running perfectly smoothly for me, which was not the case back when I built this system at the beginning of April. The game heavily favors Intel CPUs, and I was very disappointed in its performance back then because I couldn't get it to run smoothly.
A lot has changed since then, so I can't point at any one thing which may have fixed it; AMD updates, NVIDIA drivers, Windows 10 FCU improvements etc. Make sure your OS and drivers are up to date.
Sorry to hijack the post a bit, but how did you notice gsync was running? Indicator?
 

Pargon

Member
Oct 27, 2017
12,037
Sorry to hijack the post a bit, but how did you notice gsync was running? Indicator?
My monitor has an "FPS Counter" option in the OSD. If G-Sync is active, it will change in sync with the framerate. If it's not active, it stays at 100. (since it's a 100Hz monitor)
There's also a G-Sync indicator that you can activate via the Display menu in the NVIDIA Control Panel, but I think that always stays on-screen rather than notifying you and then disappearing.
I think most or all G-Sync monitors also have an indicator LED, but if you set G-Sync to "Fullscreen & Windowed" mode, then it's always "active" since everything runs in windowed mode.
 

Lashley

<<Tag Here>>
Member
Oct 25, 2017
60,075
My monitor has an "FPS Counter" option in the OSD. If G-Sync is active, it will change in sync with the framerate. If it's not active, it stays at 100. (since it's a 100Hz monitor)
There's also a G-Sync indicator that you can activate via the Display menu in the NVIDIA Control Panel, but I think that always stays on-screen rather than notifying you and then disappearing.
shit mine has this too, but I never thought to use it aha, so if it fluctuates Gsync is active?

I have a asus pg248Q