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.”



2257 Comments For “G-SYNC 101”

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Divij
Member
Divij

Thank you for this amazing article.

I am struggling to find the optimal settings for my set up to play Microsoft Flight Simulator. Anything above 30 FPS works well as long as it is stutter and lag free.

The refresh rate for my monitor is 144hz and I have capped the FPS to 35 in Nvidia Control Panel. G Sync is enabled and V Sync set to On in Nvidia Control Panel.
V sync is off in game.

Another option is to use 100hz refresh on my monitor and use in game V sync to 1/3rd of my monitor refresh rate which locks the FPS at 33. This way I do not need to lock the FPS in the Nvidia Control Panel. The only in game V Sync options are (locked at refresh rate, half refresh rate & 1/3rd refresh rate)

Which of the two options would you recommend for stutter, lag free and overall best experience?

Thank you for all your help!

Vykal
Member
Vykal

Hi, thanks for sharing the guide. I would like to ask what the optimal settings for Apex Legends would be with Nvidia reflex and Gsync on 240hz monitor with Gsync module.

1) Is in-game double buffer vsync recommended over NVCP vsync for Apex Legends?
2) Does nvidia reflex cap use in-game limiter or external limiter (NVCP)?
3) Nvidia Reflex with Gsync and Vsync has an auto FPS limit. Should I limit the FPS in-game slightly below the Nvidia Reflex auto fps cap to attain any benefits to lower latency or smoother gameplay?

Thank you in advance!

Vickyy
Member
Vickyy

Hello i wanted to ask about LLM, i use 144 hz monitor and i do FPS Limiting from Nvidia Control Panel to 141, is V-Sync ON from Nvidia Panel will do somethink bad for the input lag or whatever while combining it with G-Sync, i disabling V-Sync in game and adding V-Sync from Nvidia Control Panel, and now for the LLM, is it important to use LLM while if im not wrong it can reduce part of the FPS in example if you play high game you probably can reduce some fps because of LLM.

Vickyy
Member
Vickyy

Also in what i saw using in game limiter can do lower latency than limiting fps in nvidia control panel or whatever outside, is the difference really that big ? Because im playing Godfall example that doesnt have in game fps limiter and im using 141 fps in Nvidia Control Panel i can try 142 aswell.

SalanMH3
Member
SalanMH3

I have gsync 144hz monitor and I set max FPS to 138 using NVCP (RTSS interfere with my games online services like FH5), but if a game has a built in FPS limiter, like 60 (Dark Souls), 90 (Batman AK), or 120 (HZD) max FPS (something below my global 138 max fps), will that cause any conflict or impact on performance? Just asking cause I don’t want to keep turning off max fps from NVCP before I play games that have built-in fps limiter (which set below my global FPS limit).

sh1tp1s
Member
sh1tp1s

Hi
Just bought a AOC24g2 144hz monitor, I usually play valorant and frames fluctuate between 130ish to 190 ish fps. is it worth to turn on Gsync + Vsync +reflex as screen tearing and frame slowdowns bothered me on my previous monitor and the latency penalty is relatively small ( 11ms with gsync+ nvcp vsync capped at 141fps vs 8-9ms uncapped with no gsync+vsync).

Thanks!

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