G-SYNC 101: G-SYNC vs. V-SYNC w/FPS Limit


So Close, Yet So Far Apart

On the subject of single, tear-free frame delivery, how does standalone double buffer V-SYNC compare to G-SYNC with the same framerate limit?

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

As the results show, but for 60Hz (remember, a “frame” of delay is relative to the refresh rate), the numbers are relatively close. So what’s so great about G-SYNC’s ability to adjust the refresh rate to the framerate, if the majority of added input latency with V-SYNC can be eliminated with a simple FPS limit? Well, as the title of this section hints, it’s not quite that cut and dry…

While it’s common knowledge that limiting the FPS below the refresh rate with V-SYNC prevents the over-queuing of frames, and thus majority of added input latency, it isn’t without its downsides.

Unlike G-SYNC, V-SYNC must attempt to time frame delivery to the fixed refresh rate of the display. If it misses a single one of these delivery windows below the maximum refresh rate, the current frame must repeat once until the next frame can be displayed, locking the framerate to half the refresh rate, causing stutter. If the framerate exceeds the maximum refresh rate, the display can’t keep up with frame output, as rendered frames over-queue in both buffers, and appearance of frames is delayed yet again, which is why an FPS limit is needed to prevent this in the first place.

When an FPS limit is set with V-SYNC, the times it can deliver frames per second is shrunk. If, for instance, the FPS limiter is set to 59 fps on a 60Hz display, instead of 60 frames being delivered per second, only 59 will be delivered, which means roughly every second a frame will repeat.

As the numbers show, while G-SYNC and V-SYNC averages are close over a period of frames, evident by the maximums, it eventually adds up, causing 1/2 to 1 frame of accumulative delay, as well as recurring stutter due to repeated frames. This is why it is recommended to set a V-SYNC FPS limit mere decimals below the refresh rate via external programs such as RTSS.

That said, an FPS limit is superior to no FPS limit with double buffer V-SYNC, so long as the framerate can be sustained above the refresh rate at all times. However, G-SYNC’s ability to adjust the refresh rate to the framerate eliminates this issue entirely, and, yet again, beats V-SYNC hands down.



2423 Comments For “G-SYNC 101”

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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.

doudi777
Member
doudi777

Hello, I have a Gsync 120Hz compatible screen. My settings are as follows: GSYNC ON + VSYNC ON (nvidia panel) + CAP 60FPS (I play in 60pfs that’s enough for me) do I have the right settings?

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