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 manipulates 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.


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 (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.”

220 Comments For “G-SYNC 101”

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pls help. i have a 1060 gtx and an acer predator and i can’t seem to setup g sync. my process stops at the start. i’m not given the option to set up g sync. i have the latest drivers. any help appreciated


Quick question: Now i have i5-8600 @ 5.0GHz and 1080Ti – 16 GB Ram, current settings:
Nvidia Panel: V-Sync – ON, In Game: OFF
Limit CAP: 141 fps, im playing only Battlefield V msi afterburner – riva showing 141fps in game and 7.0ms delay its ok? if i change to 142, it will change something?


Based on the graphs, you’ve only shown the hertz comparison with both G-sync and V-sync enabled + frame cap. If you disabled V-sync would I get even less input lag?

NOTE: I’m going for a fighting game locked at 60 fps on a monitor that can be overclocked to 165Hz; would 165Hz: G-sync w/ V-sync OFF (NVCP) + 60 fps limit provide the most optimal performance and experience for a fighting game?



i’ve noticed a weird flickering at the top of the screen in most games.

I have a 1080ti and an asus pg348q

The only way I found to make that disappear is to turn on fast sync but then I have stuttering in game so it’s obviously not a good solution.

Does someone else has this issue? How to solve it?

I set up the parameters as told on that page

Vsync ON in NVCP
GSync full screen
RTSS at 97 fps (monitor refresh rate-3)

Thanks a lot for the help


Hi jorimt, you did a realy great arcticle and this site best i know for informations like this!

Im using an 1440p overclocked 165HZ Acer Monitor with an i7700k and Gigabite Aorus 1080ti for shooter games and searching for the lowest possible input lag. With my favorite in game graphic settings mostly i get 160-200 fps.
my conclusion for lowest input leg:
i should disable gsync, vsync(game and nvcp) and tripple buffering and set the game on fullscreen. sure i earn a bit tearing but seems thats no problem for me.
Im right? anything else i can do?

do you think the bit more input lag with your recomended gsync settings (how much more you think in ms?) would be noticeable (gsync on, vsync nvcp on, rtss cap 162hz(there is no ingame cap option)?

Many thanks!