G-SYNC 101: G-SYNC Ceiling vs. V-SYNC


Identical or Fraternal?

As described in G-SYNC 101: Range, G-SYNC doesn’t actually become double buffer V-SYNC above its range (nor does V-SYNC take over), but instead, G-SYNC mimics V-SYNC behavior when it can no longer adjust the refresh rate to the framerate. So, when G-SYNC hits or exceeds its ceiling, how close is it to behaving like standalone V-SYNC?

Blur Buster's G-SYNC 101: Input Latency & Optimal Settings
Blur Buster's G-SYNC 101: Input Latency & Optimal Settings
Blur Buster's G-SYNC 101: Input Latency & Optimal Settings
Blur Buster's G-SYNC 101: Input Latency & Optimal Settings
Blur Buster's G-SYNC 101: Input Latency & Optimal Settings
Blur Buster's G-SYNC 101: Input Latency & Optimal Settings

Pretty close. However, the G-SYNC numbers do show a reduction, mainly in the minimum and averages across refresh rates. Why? It boils down to how G-SYNC and V-SYNC behavior differ whenever the framerate falls (even for a moment) below the maximum refresh rate. With double buffer V-SYNC, a fixed frame delivery window is missed and the framerate is locked to half the refresh rate by a repeated frame, maintaining extra latency, whereas G-SYNC adjusts the refresh rate to the framerate in the same instance, eliminating latency.

As for “triple buffer” V-SYNC, while the subject won’t be delved into here due to the fact that G-SYNC is based on a double buffer, the name actually encompasses two entirely separate methods; the first should be considered “alt” triple buffer V-SYNC, and is the method featured in the majority of modern games. Unlike double buffer V-SYNC, it prevents the lock to half the refresh rate when the framerate falls below it, but in turn, adds 1 frame of delay over double buffer V-SYNC when the framerate exceeds the refresh rate; if double buffer adds 2-6 frames of delay, for instance, this method would add 3-7 frames.

“True” triple buffer V-SYNC, like “alt,” prevents the lock to half the refresh rate, but unlike “alt,” can actually reduce V-SYNC latency when the framerate exceeds the refresh rate. This “true” method is rarely used, and its availability, in part, can depend on the game engine’s API (OpenGL, DirectX, etc).

A form of this “true” method is implemented by the DWM (Desktop Window Manager) for borderless and windowed mode, and by Fast Sync, both of which will be explained in more detail further on.

Suffice to say, even at its worst, G-SYNC beats V-SYNC.



2425 Comments For “G-SYNC 101”

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richardjohnsonfa
Member
richardjohnsonfa

If I have a amd gpu and freesync monitor, shall I follow your optimal settings but using freesync instead of g sync and amd chill fps limiter 3 fps under my monitors refresh rate instead of nvcp’s fps limiter. So it would essentially be freesync (using amd software) + v sync (using amd software or in game) + -3 fps below refresh rate limiter (using amd software, i.e. amd chill, or in game). Would it work the same as in your optimal settings? Thanks jorimt 🙂

Scandaal
Member
Scandaal

What do I need to set in the NVCP display settings if I use G Sync, I have an ASUS VG248QG 165HZ monitor.

At the moment I have No Scaling + Display set

Scandaal
Member
Scandaal

Hello I play WarZone 2 and I am interested in the G SYNC + V Sync setting, I currently have G Sync and V Sync enabled (In NVCP), also I enabled NVIDIA Reflex in the game settings and now my FPS is limited to 158fps (Monitor 165hz).

Can you tell me the optimal G Sync settings for this game, maybe there are better options to get optimal smoothness without frame tearing and micro staters

RTX 3060 / 12400 5Ghz / 3466 CL14

Virtpilot
Member
Virtpilot

Hello,
this is my first post in here and I would like to ask, how to properly set up my monitor for MSFS 2020. My monitor is Asus VG27AQ. I got adaptive sync on from the monitor, g-sync on from the Nvidia control panel as well v-sync on, and the refresh rate is 144hz. The thing is that I am not interested about high frame rates. 35fps-40fps is enough for me. But how to keep the frame time smooth? Should I lower the refresh rate of my monitor or/and cap the frame rates? Is g-sync any good in my situation? My monitor is not proper g-sync monitor, it is g-sync compatible. I´m looking forward for any tips as I have tried all kinds of combinations but maybe you professionals can say the last word….

johnsan05
Member
johnsan05

hi,i really need your help.
so this is my setup
rtx 3050 8gb
16gb ram
ryzen 5 3500x
and i have a 165 HZ monitor.
i only playing war thunder atm…and heres my problem.
ive tried almost every different settings,vsync on and off (in game) with gsync enabled..
tryied everything turned off aswell
and i keep getting the same problem..my english is not that good,but im going to try me best because ive been looking for help,and nothing semms to solve the issue.
ive changed the refresh rate of my monitor to 144HZ,because my computer only seems to reach a maximum of 139-140 in ANY game settings,if thats even make sense.
ive tried to cap the fps ate 138,and acctually,it does feel better playing..the game can keep with that number most of the time,and even when it drops,its not that BAD.
but the problem is,when i play high tier battles,wich means jets,and modern battle tanks,the game starts to get in my nerves.
the fps still at 138,but as son i get into the ‘battle zone’ is drops a little,from 138 to 119 ,for example.
but the sensation is that im playing at 20FPS.
its terrible,and as i said,ive tried different setting,in different scenarios,but nothing seem to solve the issue.
would you please,give me some help?
again,my english is not that good,but any help would be great !
i really think that with my setup i could easily play this game,at least at high settings without no problem at all..i think the problem is the monitor,or the settings im using ( vsync /gsync)
i will wait for your answer.
thanks.

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