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.”



1304 Comments For “G-SYNC 101”

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uncanny
Member
uncanny

Hello,

Great article. I have a question for freesync monitor with AMD GPU. Radeon has three settings for vsync: always on, always off, off unless application specifies, on unless application specifies. In order to follow your optimal setting(I am assuming it also applies to freesync and amd cards) of freesync+vsync on in driver setting and off in game setting with -3 frame limiter for no screen tearing with as low input lag as possible, do I pick always on or on unless application specifies? Thanks.

MarkyMark
Member
MarkyMark

Hello,

In my search for a 49” monitor for flight simulation I have the following questions.

Is it a must for me to go for a monitor with Gsync or Freesync?
Is maybe just Vsync enough?
Or what should I tweak in the settings to overcome any stutters or tearing, without the use of VRR tech?

I’m planning to build a PC specially for flight simulator.
My aim is to get between 30 and 60 fps on a resolution of 5120X1440.
The screen I had in mind is:

https://www.samsung.com/nl/monitors/curved-qled-gaming-monitor-c49rg9/

I hope to find my answers here to make me finally decide wich monitor to buy.

Thanks in advance,

Mark

X-avier2507
Member
X-avier2507

Hi!

Currently using this settings for a 144hz adaptive sync monitor and it runs buttery smooth!

I was wondering, what are your recommended settings for better input lag when playing on a 4k/60hz TV that has no apative sync technology at all? Should vertical sync be turned off everywhere?

yamaci1775
Member
yamaci1775

Hello, I’d like to share my experience. I’ve been playing the game Rogue Company for some time and I have some issues

First of all, my computer can reliably put stable 180+ fps in this game (ryzen 2700x and gtx 1080). Not an issue there.

My problem goes like this;

When I use Vsync on + Freesync + 138 FPS cap, the experience changes completely. Mouse feels like a slog, it feels like there is a big input lag difference and sensitivity seems messed up? Does Freesync messes up the mouse sensitivity?

I tried disabling freesync altogether, with or without fps cap, my aim became much more accurate and could score more kills easily, and mouse doesn’t feels weird

Do you have any idea why freesync behaves like this on my viewsonic xg2401?

I had the opposite experience on overwatch, where freesync+ 138 fps cap still proved good input lag and i could enjoy the game

is it possible the problem is the game?

kevinhtx
Member
kevinhtx

hey man can you recommend me some cod mw warzone (warzone)? i have a 240hz LG 27GN7 monitor. and i always prefer preformance over quality.

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