G-Sync Compatible problem?

[DivineBlack]

Heyo,

My Monitor ( 1080 p 144 hz) supports G-Sync compatible, so i tested a few things. If its working correctly, because it doesnt feel like it.

I noticed that my Monitor has an option to display the current refresh rate, so i turned it on.

Now my question, is it normal that my Refresh rate/Hz is going crazy from ~80 - ~120 at around 100 FPS? Even at 141 FPS (capped) / 144 FPS it goes up and down from 144 to 120 hz.

 

In the video below you can see how the refresh rate changes  with stable 60 FPS and G-Sync on.

[WereCat]

That counter is not displaying FPS but Hz.

When GSync/FreeSync is enabled the refresh rate of the monitor must match the frame output of the graphics card and refresh it at once to remove tearing.

 

Your in game FPS is not a good metric to represent this.

The frames are not evenly rendered over 1s, you just see the total amount of frames rendered during that 1s.

[DivineBlack]

1 minute ago, WereCat said:

That counter is not displaying FPS but Hz.

When GSync/FreeSync is enabled the refresh rate of the monitor must match the frame output of the graphics card and refresh it at once to remove tearing.

 

Your in game FPS is not a good metric to represent this.

The frames are not evenly rendered over 1s, you just see the total amount of frames rendered during that 1s.

The number you see is the current refresh rate running wild even thought i have stable 60 fps at this moment

[WereCat]

Just now, DivineBlack said:

The number you see is the current refresh rate running wild even thought i have stable 60 fps at this moment

ignore FPS

frame times are important here

[DivineBlack]

3 minutes ago, WereCat said:

ignore FPS

frame times are important here

Got a constant frametime of 16.6 ms at 60 Fps. So is it normal that the refresh rate varies that much? I thought it adapts the current FPS and stays pretty stable.

[WereCat]

5 minutes ago, DivineBlack said:

Got a constant frametime of 16.6 ms at 60 Fps. So is it normal that the refresh rate varies that much? I thought it adapts the current FPS and stays pretty stable.

frametime is never perfectly constant

 

if each frame is rendered exactly 16.6ms from each other then the monitor should show exactly 60

 

however if most frames are rendered between 15ms and 17ms then you will see the fluctuation you see there as it goes under and above 60

 

if suddenly some frame gets rendered in 5ms then the monitor has to rapidly change the refresh rate to remove the tear so thats why you see the jump above 100 and back down again

[DivineBlack]

Just now, WereCat said:

frametime is never perfectly constant

 

if one frames are rendered exactly each 16.6ms then the monitor should show exactly 60

 

however if most frames are rendered between 15ms and 17ms then you will see the fluctuation you see there as it goes under and above 60

 

if suddenly some frame gets rendered in 5ms then the monitor has to rapidly change the refresh rate to remove the tear so thats why you see the jump above 100 and back down again

Ok, got it. Thank you for the help! Thought my monitor or GPU has a problem.