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G-Sync not working with V-Sync off?

lamboman

lamboman

lamboman

Soldato
Joined
7 Apr 2008
Posts
2,655
Hi all,

I'm running the latest drivers (359.00) for my SLIed 980Tis. G-Sync works fine with V-Sync On in the Nvidia Control Panel, however if G-Sync is turned off, no matter whether that be in the game settings with "Let the 3D application decide" set, or in Nvidia Control Panel, G-Sync simply doesn't work. Restricting the frame rate in-game to keep it within the G-Sync range (up to 100Hz on the X34) doesn't work either, just results in G-Sync not being enabled.

I'm 99.9% sure this is a bug, however searching online for a solution has produced no results. Input lag is noticeably increased with V-Sync enabled, hence why I'd rather cap the frame rate (which is known to keep input lag low, particularly in CS:GO).

Is anybody aware of a fix? Help would be much appreciated!

Thanks in advance!
 
The V-Sync on/off option in the nVidia control panel changes its behaviour when G-Sync is enabled - On is normal G-Sync where it caps at the highest refresh rate your monitor supports Off now works upto the highest refresh rate your monitor supports but if you can render faster than that it will temporarily suspending G-Sync so you will get tearing - but the lowest possible input latency.

For the lowest input latency with G-Sync enabled you need to cap your framerate to 120-135fps with a 144/165Hz panel.

EDIT: With the X34 you will probably want to cap in the range of 85-94 fps (you might get away with closer to 100 but I don't have one to test and can only simulate it on my Swift) for optimal input latency - capping at 100fps will probably actually increase the amount of input latency you perceive as you will likely get uneven frametimes.
 
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Hi all,

Rroff - just tried that before I even read your post, and yes, just happens that capping at 85fps works wonders. No perceivable difference in smoothness however input lag is completely gone. Lovely!

Thanks for the responses :)
 
I love G-Sync but i think there is a lot of people with misconceptions on what to do with there settings including myself. You would think Nvidia could make it easier for everybody surely?
 
Simon Belmont said:
With G-sync you shouldn't have to cap fps. G-sync does it for you automatically. You just have to leave v-sync on the control panel.
Click to expand...
You say this and your point of view is 100% correct, however for whatever reason, whether this is a bug or some design flaw, G-Sync/V-Sync settings aren't working properly and manual capping is required. As per my first post, G-Sync should work in the monitor's range regardless of the V-Sync setting, but for some reason this isn't the case. Turning V-Sync on in the Control Panel is the only solution as far as I can see, but in CS:GO it introduces tons of input lag (to the point it is unplayable). Capping the frame rate manually sorts the input lag issue.

I've tested this in BF4, and while G-Sync still doesn't work with V-Sync disabled, there is no hit on input lag, so no capping is required. V-Sync on is the ideal here anyway.

Watlinguk said:
I love G-Sync but i think there is a lot of people with misconceptions on what to do with there settings including myself. You would think Nvidia could make it easier for everybody surely?
Click to expand...
I'd say that the misconceptions aren't Nvidia's fault, seeing as the commonly-referenced blog post explaining the feature is crystal clear: http://www.geforce.com/whats-new/articles/g-sync-gets-even-better

What is Nvidia's fault is that in the latest drivers at least, it doesn't work as described. No amount of tweaking settings can fix it.
 
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lamboman said:
You say this and your point of view is 100% correct, however for whatever reason, whether this is a bug or some design flaw, G-Sync/V-Sync settings aren't working properly and manual capping is required. As per my first post, G-Sync should work in the monitor's range regardless of the V-Sync setting, but for some reason this isn't the case. Turning V-Sync on in the Control Panel is the only solution as far as I can see, but in CS:GO it introduces tons of input lag (to the point it is unplayable). Capping the frame rate manually sorts the input lag issue.

I've tested this in BF4, and while G-Sync still doesn't work with V-Sync disabled, there is no hit on input lag, so no capping is required. V-Sync on is the ideal here anyway.


I'd say that the misconceptions aren't Nvidia's fault, seeing as the commonly-referenced blog post explaining the feature is crystal clear: http://www.geforce.com/whats-new/articles/g-sync-gets-even-better

What is Nvidia's fault is that in the latest drivers at least, it doesn't work as described. No amount of tweaking settings can fix it.
Click to expand...

It could be a driver issue with some games? Maybe a g-sync issue with the monitor your using? No issue with my Asus swift
 
Simon Belmont said:
If you have to cap your frames using g-sync then G-Sync isn't doing it's job.
Click to expand...

I disagree. If you don't cap your frame rate below your monitor refresh rate, then Gsync will revert to Vsync and cap at the maximum refresh anyway.

Always make sure your frame rate is below your max refresh rate, is my understanding. In most games I don't need to cap, because with max settings at 1440p the game usually can't hit the max refresh rate of 120Hz anyway.
 
String said:
I disagree. If you don't cap your frame rate below your monitor refresh rate, then Gsync will revert to Vsync and cap at the maximum refresh anyway.

Always make sure your frame rate is below your max refresh rate, is my understanding. In most games I don't need to cap, because with max settings at 1440p the game usually can't hit the max refresh rate of 120Hz anyway.
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Untrue. I don't cap my frames. My Asus swift caps it's self when g-sync is working. My g-sync is working just fine.
 
Currently I only play 2-3 games all of which have an ingame option - there are framerate limiters in things like MSI Afterburner and the nVidia one can be accessed by nVidia Inspector though I've had 1-2 black screens caused by it on older drivers and not tried since.
 
See how far you can push it - I can only guess at the most optimal value as it might be different to what works on the Swift but its generally been a thing with G-Sync that capping slightly under the max refresh reduces input latency considerably.
 
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