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To vsync or not to vsync..

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14 hours ago, w6kd said:

I have a 30Hz monitor (55" TV) and have VSync on and frame rate limiter set to 60.  Nice and smooth locked at 30 fps due to the VSync.

Did you manually set your Refresh rate to 30Hz? Reason I ask is I am using a plain old 42" 1080P LED TV which is set to 60Hz and I have VSync on and the frame rate limited to 60 which to achieve I have to dial the settings down and can only get this with the smaller GA aircraft. The 152 seems to perform best on my system. Airliners are a disaster lol

 

Richard

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4 minutes ago, Richdem said:

Did you manually set your Refresh rate to 30Hz? Reason I ask is I am using a plain old 42" 1080P LED TV which is set to 60Hz and I have VSync on and the frame rate limited to 60 which to achieve I have to dial the settings down and can only get this with the smaller GA aircraft.

I set 30 Hz manually in nVidia Control Panel: Display -> change resolution -> refresh rate  The TV syncs to the 30Hz signal automatically.

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35 minutes ago, Nyxx said:

I use the NV control to limit MSFS to 30 FPS and with FRAPS ON FPS are locked solid at 30.

Also I have a 120 Hz Monitor and If i set VS ON and then I have option for 120/60/30/20 FPS. If I then set to 30 that also limited FPS to 30. But then I don't change settings once I begin.

Both work. But it needs fixing if you mess with setting after you begin.

But try opening a drop down window in flight.... To change weather or time.

When I do that and then close the window, Vert Sync breaks and the FPS shoot up from 60 and go all over the place.

I'm running in Full Screen using DP 2.0 cable.

I tried a HDMi cable. Same thing.

Getting a G sync OLED soon so hopefully it won't be a long term issue ... For me ... but it shouldn't be like this.

 

2 minutes ago, Gabe777 said:

But try opening a drop down window in flight.... To change weather or time.

When I do that and then close the window, Vert Sync breaks and the FPS shoot up from 60 and go all over the place.

I'm running in Full Screen using DP 2.0 cable.

I tried a HDMi cable. Same thing.

Getting a G sync OLED soon so hopefully it won't be a long term issue ... For me ... but it shouldn't be like this.

 

No I believe you, I just set up a flight with live weather/time and never change anything and all is good. I watched you Vid and I agree it needs fixing.

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5 minutes ago, w6kd said:

I set 30 Hz manually in nVidia Control Panel: Display -> change resolution -> refresh rate  The TV syncs to the 30Hz signal automatically.

So you cannot run MSFS at 60 FPS locked. You have to limit it to 30 ?

OMG. This gets better.

I get perfect 60 until I change a setting. Then it breaks.

  • Commercial Member

With Display port, 30Hz refresh set in NCP and VSYNC=ON in MSFS I see 15 fps with 30 limit in MSFS, and I see 30fps with 60 limit in MSFS. I suspect the same thing is happening on TV monitors with HDMI. So looks like a VSYNC bug.

Steve Waite: Engineer at codelegend.com

  • Commercial Member

Same with 24Hz, getting half that 12fps.

So the smoothness is gained from avoiding the frame rate being halved. We should avoid posts that offer a generalisation of setting a higher limit than the monitor refresh which in normal circumstances would not be of any practical value.

Steve Waite: Engineer at codelegend.com

3 hours ago, SteveW said:

Actual fps can be shown in the developer mode Options menu, Display fps. That might be showing "limited by mainthread" and a lower fps selected than the limit value set.

How do you get into Developer Mode?

  • Commercial Member

In Flight, press Escape, then choose General section, then down the list is Developers, set developer mode to on. You get a small menu along the top of screen. In Options, Rendering, choose Display FPS.

Steve Waite: Engineer at codelegend.com

  • Commercial Member

I am finding it better to leave the monitor at 60Hz refresh, on this monitor that is the maximum, other monitors vary. On a 30Hz TV that issue with VSync might come up and although setting is at 60 limit, that is in fact limiting to 30fps, setting 30 limits to 15fps.

I am finding it better to leave my monitor at 60Hz refresh to set VSync=On and 30 Limit in MSFS Graphics, Display Settings.

Steve Waite: Engineer at codelegend.com

  • Commercial Member

...Using the higher refresh if available ensures the shortest possible long frames since there is less time to wait for the next refresh cycle as I already mentioned.

Steve Waite: Engineer at codelegend.com

Ignore.

Starting again.

Edited by Gabe777

Ignore.

Edited by Gabe777

5 hours ago, Ianrivaldosmith said:

Turn off V-sync if you have a G-Sync monitor, and then enable Gsync for full screen and windowed mode. To be honest, I would never ever go back to a fixed refresh rate monitor, G-Sync blows them away! Specially in this new sim! 

 

V-Sync should be turned off in FS2020, but enabled in Nvidia inspector if you have a g-sync monitor.

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6 hours ago, Ianrivaldosmith said:

Correct, but using  VSYNC in the nvidia control panel, in case you go over your monitors max refresh rate (unlikely in MSFS for most) . You do NOT use Vsync in the application (game) 

Exactly, which is why I said external vsync.

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