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.


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.”

3121 Comments For “G-SYNC 101”

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Great post. I have a quick question? Apex legends operates the smoothest when I cap my fps to my monitor (lg oled 240 g sync compatible) refresh rate using the command line in apex startup & putting “use 3D application” for my NVCP vsync option.

Now the weird part is I HAVE to use triple buffer for apex in-game vsync for it to run butter smooth. Is this one of those “rare” occasions for apex? Thanks in advance!


Do you know why NVIDIA’s Reflex is capping at 224 FPS (240 HZ GSYNC Capable Monitor + NVCP VSYNC ON + IN GAME VSYNC OFF) So my question is why is it capping at 224 FPS? What will happen if I will set in NVIDIA’s Panel FPS cap at 224 FPS as well. Will it override it or not? Or it overrides it only when it is less then Reflexes one? But why it sets it way lower than your recommended minimum of “-3 FPS bellow max refresh rate”, any ideas? Just curious.


hi, a quick question, i have a lg 27gl850-b monitor with gsync compatible, i have been following this guide and so far it has been working fine but there are some things i don’t understand from the guide, i have it like this:

In the nvidia panel:
Latency: Ultra

In game:
(there are some games that have reflex and I have it as reflex + boost)

Rivatuner 141hz (-3) as my monitor is 144

my question is: is it ok? so far the frametime line is almost always smooth since I have 5800x3d + rtx 3080 except sometime there is some very small peak but this is normal since it can not always go straight, I want to be sure to disable the metrics and play without anything on the screen, all my games are smooth and almost all go to 141 fps except fornite that I am limited to 138


Hello @Jorimt
I’ve got Asus PG279Q monitor (built-in Gsync module). I usually play old games based on DirectX 8 and 9. I use Windows 7×64. I’ve been wondering what would be the optimal GSYNC settings for me case (in comparison to the one you provided)?


Sorry to comment on this old article but I have a question: will Gsync still function as intended if you use the games Vsync because there are some games such as Dark souls II or Skyrim SE that force Vsync on and it cannot be disabled.