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.”



239 Comments For “G-SYNC 101”

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bioinfinite121818
Member
bioinfinite121818

Hi, I was wondering I recently bought a g sync 240hzmonitor and I have g sync and nvidia v sync on, should I lower the refresh rate of my monitor 237 or is okay if I can keep it at 240?

rayjays1986
Member
rayjays1986

Was wondering, do you have any advice on State of Decay 2? I seem to be having major stutter/lag issues with that game and G-Sync. It’s hard to explain, it’s almost as if there’s some sort of asset loading going on while I’m driving especially, and it looks quite laggy/stuttery. I have seen numerous others talk of this, and numerous others who say it runs smooth as butter. I change over to fixed refresh and vsync, and it seems to help a little, but it’s not totally gone. BUT, using fixed refresh w/ fast sync, it almost (not quite but almost) eliminates the effect, with the lag much less apparent. I experimented a bit and G-sync plus fast sync seems to help too, though here it says not to do that. I wouldn’t think of doing that in anything else, I just seen several posts that it had something to do w/ that game/engine in particular w/ G-sync and laggy/stuttery moments on occasion. Did you (or anyone else here) happen to experience any of this with State of Decay 2? If so, anyone know how to fix it? I actually really enjoy the game, but that lag is incredibly annoying for me (seems to happen most when I’m driving). Thanks in advance for any answers!

Xaejohn
Member
Xaejohn

Hello jorimt,

I would like to know why you’re still using “G-SYNC + V-SYNC ON” with 144Hz Refresh Rate and 60 FPS limit. Couldn’t we just disable V-SYNC as we aren’t in the Upper FPS range?

Thank you!

rpate124
Member
rpate124

Should I be in exclusive fullscreen mode for this to minimize input lag or is it not noticeable in borderless mode?

Deathlok
Member
Deathlok

I have a 60hz monitor, without G-sync.
In State of Decay 2, you do not have the Exclusive Fullscreen option, just boardless window. But triple buffering is not active. When it has a drop below 60 fps, the game sttutering to 30fps.

I tried activating Fast sync and limiting at 60 fps over RTSS. It helped, but sometimes I noticed sttutering, even with the framerate at 60.

Which is the best setting for me

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