G-SYNC 101: Control Panel


G-SYNC Module

The G-SYNC module is a small chip that replaces the display’s standard internal scaler, and contains enough onboard memory to hold and process a single frame at a time.

The module exploits the vertical blanking interval (the span between the previous and next frame scan) to manipulate the display’s internal timings; performing G2G (gray to gray) overdrive calculations to prevent ghosting, and synchronizing the display’s refresh rate to the GPU’s render rate to eliminate tearing, along with the delayed frame delivery and adjoining stutter caused by traditional syncing methods.

G-SYNC Demo

The below Blur Busters Test UFO motion test pattern uses motion interpolation techniques to simulate the seamless framerate transitions G-SYNC provides within the refresh rate, when directly compared to standalone V-SYNC.

G-SYNC Activation

“Enable for full screen mode” (exclusive fullscreen functionality only) will automatically engage when a supported display is connected to the GPU. If G-SYNC behavior is suspect or non-functioning, untick the “Enable G-SYNC, G-SYNC Compatible” box, apply, re-tick, and apply.

Blur Buster's G-SYNC 101: Control Panel

G-SYNC Windowed Mode

“Enable for windowed and full screen mode” allows G-SYNC support for windowed and borderless windowed mode. This option was introduced in a 2015 driver update, and by manipulating the DWM (Desktop Windows Manager) framebuffer, enables G-SYNC’s VRR (variable refresh rate) to synchronize to the focused window’s render rate; unfocused windows remain at the desktop’s fixed refresh rate until focused on.

G-SYNC only functions on one window at a time, and thus any unfocused window that contains moving content will appear to stutter or slow down, a reason why a variety of non-gaming applications (popular web browsers among them) include predefined Nvidia profiles that disable G-SYNC support.

Note: this setting may require a game or system restart after application; the “G-SYNC Indicator” (Nvidia Control Panel > Display > G-SYNC Indicator) can be enabled to verify it is working as intended.

G-SYNC Preferred Refresh Rate

“Highest available” automatically engages when G-SYNC is enabled, and overrides the in-game refresh rate selector (if present), defaulting to the highest supported refresh rate of the display. This is useful for games that don’t include a selector, and ensures the display’s native refresh rate is utilized.

“Application-controlled” adheres to the desktop’s current refresh rate, or defers control to games that contain a refresh rate selector.

Note: this setting only applies to games being run in exclusive fullscreen mode. For games being run in borderless or windowed mode, the desktop dictates the refresh rate.

G-SYNC & V-SYNC

G-SYNC (GPU Synchronization) works on the same principle as double buffer V-SYNC; buffer A begins to render frame A, and upon completion, scans it to the display. Meanwhile, as buffer A finishes scanning its first frame, buffer B begins to render frame B, and upon completion, scans it to the display, repeat.

The primary difference between G-SYNC and V-SYNC is the method in which rendered frames are synchronized. With V-SYNC, the GPU’s render rate is synchronized to the fixed refresh rate of the display. With G-SYNC, the display’s VRR (variable refresh rate) is synchronized to the GPU’s render rate.

Upon its release, G-SYNC’s ability to fall back on fixed refresh rate V-SYNC behavior when exceeding the maximum refresh rate of the display was built-in and non-optional. A 2015 driver update later exposed the option.

This update led to recurring confusion, creating a misconception that G-SYNC and V-SYNC are entirely separate options. However, with G-SYNC enabled, the “Vertical sync” option in the control panel no longer acts as V-SYNC, and actually dictates whether, one, the G-SYNC module compensates for frametime variances output by the system (which prevents tearing at all times. G-SYNC + V-SYNC “Off” disables this behavior; see G-SYNC 101: Range), and two, whether G-SYNC falls back on fixed refresh rate V-SYNC behavior; if V-SYNC is “On,” G-SYNC will revert to V-SYNC behavior above its range, if V-SYNC is “Off,” G-SYNC will disable above its range, and tearing will begin display wide.

Within its range, G-SYNC is the only syncing method active, no matter the V-SYNC “On” or “Off” setting.

Currently, when G-SYNC is enabled, the control panel’s “Vertical sync” entry is automatically engaged to “Use the 3D application setting,” which defers V-SYNC fallback behavior and frametime compensation control to the in-game V-SYNC option. This can be manually overridden by changing the “Vertical sync” entry in the control panel to “Off,” “On,” or “Fast.”



994 Comments For “G-SYNC 101”

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GlossGhost
Member
GlossGhost

Hello, I have a question regarding as you put it “terrible multi-monitor handling by windows”.
How would a 144hz or higher g-sync monitor (and freesync) react to hardware accelerated content that is being displayed on a secondary 60hz screen?
I assume that in the event of having the g-sync option enabled only for fullscreen applications, nothing will change, meaning that hardware accelerated content on the 60hz monitor will crawl down the higher refreshrate one to the lower monitors hz, which is incredibly annoying and frustrating.
How would the g-sync monitor react however, when you have the g-sync option set to the windowed and fullscreen one?
Assuming I have a browser window opened on the second lower hz monitor, that is playing a twitch stream let’s say, that is NOT fullscreened, when hardware acceleration is going on, because fullscreening doesn’t seem to crawl down the higher hz monitor in the first place (perhaps something with how hardware acceleration works when you fullscreen video source), how would the g-sync monitor react to that if I had a borderless fullscreen game showing on it for example?
I understand that having independent flip/direct flip or fullscreen on the game will let the monitor perform to it’s specs despite what the lower hz monitor has on it’s screen.

I am very curious about the answers to these questions.

memotoast
Member
memotoast

Hi, I have two 1440p 144Hz Gsync monitors (Freesync, but compatible). Not exactly the same resolution tho because one is ultrawide.
I couldn’t find anything about two monitors running Gsync. Can I enable it on both at the same time? I noticed video stuttering on youtube while gaming, could this be caused by Gsync?

Great article, really helped me to set everything else up 🙂

MaCzO
Member
MaCzO

Hi. If i play CS GO and i have more than 400 fps i should use G-SYNC + V-SYNC and LLM “Ultra” ?

Prey94
Member
Prey94

I found some of this quiet confusing.

To get the lowest possible input lag i have to disable GSync, Vsync and can keep Frames unlocked , right?

For the best tearing free and lowest possible input lag , i would lock the frames a few fps under my Monitors Max refresh Rate while keeping GSync + Vsync + LLM ON ?

Is there an easy way to get both Worlds?
Like i wanna have tearing free experience but for competive Games i want the lowest Input lag possible.

But i dont feel like switching off Gsync each time when i play certain Games.
I thought about setting up seperate profiles in the control panel for the competitive Games.
However i run into a Problem and my FPS gets limited to the Monitors max refresh Rate unless i turn off Gsync in the Gsync Tab or i use Gsync, in both cases i get unlcoked FPS but not when i enable “Fixed refresh Rate” for the specific Game.

On the other Hand when i turn off Gsync in the Gsync Tab and use “fixed refresh rate” as global setting i get unlocked FPS.
Is this a bug in the Nvidia Control Panel?

ecal
Member
ecal

In the “G-SYNC vs. V-SYNC OFF” graphs, is G-Sync disabled in subsequent scenarios? ( i.e g-sync is only ON for the first row of graphs. )

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