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.

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.”



426 Comments For “G-SYNC 101”

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mucaassad
Member
mucaassad

Hi, you told that if null ultra + vsync + gsync NVIDIA CONTROL PANEL the fps
automatically fix below refresh rate right? I have 240hz alienware and when i do this and enter in game, the fps is above 240 reaching up to 300. I tryied to gsync on + vsync on NVCP and null OFF and continues reaching 300, if vsync is on, the maximum would not be 240? Please help me! And all these settings i have a microstutters, but when i disable all the stutter is gone. Thanks for the articles and your job. Please help me

Caronize
Member
Caronize

Hi, I have a 240hz Alienware and I’m using Gsync On, Vsync FAST (not to limit to 224fps in the game) and the lowest ultra latency mode), and limit my fortnite to 237 fps. Are these the best settings? Can you tell me how to best options for my case?

Zehdah
Member
Zehdah

I have an Acer Xb270hu monitor (G-sync, 144hz) with a 1080 Ti and I’m wondering if the correct way to set things up for gaming is still as mentioned in your guide (https://www.blurbusters.com/gsync/gsync101-input-lag-tests-and-settings/14/)
So: G-sync on, V sync OFF in game, V sync ON in Nvidia control panel and cap FPS to 3 below max (141 for me at 144) is that correct? If so, what setting should the new low latency be at in Nvidia control panel?

Elxel
Member
Elxel

I use G-Sync with GTX1070 and XL2540. After updating the NVIDIA driver to the latest, fps is below the refresh rate of the monitor without the fps limit. How about your environment?

jamiequest
Member
jamiequest

Hi guys, I want to buy the ASUS TUF VG32VQ 31.5 inch 144hz monitor. I don’t achieve 144hz in any of my games. Will that matter? Also, does G-Sync work with the RTX 2060 Super and FreeSync monitors? Finally, if they’re compatible, will G-Sync lower my refresh rate to a suitable refresh rate to match my FPS?
Thanks guys

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