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Default 06-18-2017, 18:24 | posts: 654

I did not see this analysis here, but might help with regard to latency/input lag question.

Freesync vs Gsync - Delay analysis.






https://youtu.be/mVNRNOcLUuA
   
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Monstieur
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Default 06-19-2017, 07:45 | posts: 13

Quote:
Originally Posted by jorimt View Post
There's a difference between playing at 144Hz at 60 FPS, and playing at 60Hz at 60 FPS on a G-SYNC monitor; the first has (but for the increase in frametimes at that framerate) no additional latency, the second can have anywhere from 2-6 frames of additional delay.
I am talking about forcing the monitor to 60 Hz.

At 60 Hz with G-SYNC + VSync, "fps_max 59" in CS:GO instantly removes the delay. It is somewhat inaccurate because if you start the game with "fps_max 60", it lags. If you then reduce it to 59 the lag is gone. If you then increase it back to 60, it does not lag. I must increase it all the way to 63 to make it lag again. However when reducing it, you must go down to 59 to make the lag stop again.

For an external frame limiter like RTSS, I need to set it to 58 to stop the lag.

Last edited by Monstieur; 06-19-2017 at 12:17.
   
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RealNC
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Default 06-19-2017, 12:14 | posts: 1,004

CS:GO's frame limiter is not as accurate as RTSS. It seems to cap lower than what you set it to, and has unstable frame pacing. It is lag-free though, in contrast to RTSS.
   
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Default 06-19-2017, 16:01 | posts: 15

Quote:
Originally Posted by Monstieur View Post
I am talking about forcing the monitor to 60 Hz.

At 60 Hz with G-SYNC + VSync, "fps_max 59" in CS:GO instantly removes the delay. It is somewhat inaccurate because if you start the game with "fps_max 60", it lags. If you then reduce it to 59 the lag is gone. If you then increase it back to 60, it does not lag. I must increase it all the way to 63 to make it lag again. However when reducing it, you must go down to 59 to make the lag stop again.

For an external frame limiter like RTSS, I need to set it to 58 to stop the lag.
If you're forcing the monitor to a max refresh rate of 60Hz via the Nvidia control panel before launching CS:GO (or using a launch command to control the refresh rate), then yes, you're effectively at native 60Hz, even on a 144Hz monitor. However, if you're max refresh rate is set to 144Hz, and your limiting the framerate to 60 FPS, the 144Hz scanout speed remains in full effect with G-SYNC, and no additional delay is introduced.

As RealNC stated, while latency-free, CS:GO's fps limiter is unstable, and can fluctuate/drift quite a lot, even when you set it to the wanted limit.

I won't post a direct link here, but my "G-SYNC 101" article is complete and now published on blurbusters.com. All the answer for this and more are there...

Last edited by jorimt; 06-19-2017 at 16:09.
   
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khanmein
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Default 06-20-2017, 09:38 | posts: 1,210 | Location: Batu Pahat, Johor, Malaysia

@jorimt I have read it. By the way, 2.1.3.7 is out.
   
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Default 06-20-2017, 15:57 | posts: 15

Thanks for the heads up (on both) @khanmein.
   
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Default 06-20-2017, 16:10 | posts: 1,004

2.1.3.7 only changes the UI description of some limiter values and adds more LOD bias values:

https://github.com/Orbmu2k/nvidiaPro...e4abe711bad320

So no actual changes to anything important in our case.
   
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Default 06-20-2017, 17:15 | posts: 15

Yup, true.

Regardless, always nice to have the latest version of anything, even if only for psychological purposes
   
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Default 06-21-2017, 15:00 | posts: 9,398 | Location: USA

Quote:
Originally Posted by jorimt View Post
Yup, true.

Regardless, always nice to have the latest version of anything, even if only for psychological purposes
So wait, did you test the input lag of NV inspector with that option the author said for reduced input lag?

I think it was set fast sync + reduced lag option or something like that
   
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RealNC
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Default 06-21-2017, 15:40 | posts: 1,004

Quote:
Originally Posted by Agent-A01 View Post
So wait, did you test the input lag of NV inspector with that option the author said for reduced input lag?

I think it was set fast sync + reduced lag option or something like that
Yes, it was tested quickly, but not included in the article. The results were posted here:

http://forums.blurbusters.com/viewto...&t=3441#p26810

TL;DR: It is lower latency then the default (non-fastsync setting), but RTSS still wins by a good margin. Default: very bad (41ms). Fastsync+v1: bad (36ms). RTSS: good (28ms). In-game limiter: very good (23ms).


Btw, the most surprising thing the test uncovered is that, contrary to popular belief (me included), windowed mode g-sync gets rid of the DWM 1-frame input lag. Which is weird. Windowed mode and borderless windowed mode has the same input lag as exclusive fullscreen. But only with g-sync. Non-gsync windowed mode still has 1-frame lag.

Normally for that to happen, you'd need to be on W10's Creators Update, AND have fullscreen optimizations enabled and toggled on, AND the game in question must be on Microsoft's whitelist, AND the game must run in borderless fullscreen window mode, not in a normal window, AND pray to the Gods and have the constellations in the correct position because sometimes it doesn't even work. With g-sync, it seems we don't need to care about any of that.

Streaming CS:GO or Overwatch in a 1920x1080 window on a 1440p desktop is legit with g-sync

Last edited by RealNC; 06-21-2017 at 16:05.
   
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