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.”



1772 Comments For “G-SYNC 101”

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Ku6epgeg
Member
Ku6epgeg

Hello, sorry for my English. I have a Samsung Odyssey G7 “27” 240Hz monitor and an RTX 3070. I love playing CS GO. Tell me how the correct settings will be for CS GO? Did I understand correctly that: NVCP G-sync on, (in windowed and fullscreen mode) NVCP V-SYNC on, in game fullscreen window?
I don’t know if you understand or not what I wrote here😂, in general, just tell me the best settings in CS GO for playing with G-sync?
And thank you for the work you’ve done.

Dr1g0n
Member
Dr1g0n

Hello, I just got new TV LG Oled CX and I would like to ask about G sync settings. I have the resolution set to 4k and 120 Hz so I play games in 4k and of course not all can reach over 60fps even though I have RTX 3080.

Can I set the limit to 57 fps in Nvidia control panel or in a game and leave 120 Hz or do I have to switch to 60 Hz?

If a game can handle like more than 100 fps to 120 so I can set 117 fps and if the game is more demanding I set 57 fps but can I leave the refresh rate in settings to 120 Hz or do I have to switch it to 60 Hz?

Thank you.

Glam
Member
Glam

Hi! I’m playing CoD Black Ops Cold War. Fps jumps from 45 to 100 (at the heaviest-40-80 fps). AOC G2460 144Hz monitor (G-Sync). GPU and CPU load are often 100%. Please tell me the settings in the panel NVIDIA and CoD for comfortable gaming and lower latency. I play multiplayer.

Lokn
Member
Lokn

Hello! Firstly i want to thank you for all the information provided. I bet this took a lot of hard work.

I use a freesync monitor with a nvidia card, so i fall in the “g-sync compatibility” category.

I’m using freesync on + vsync on + low latency mode on, based on what i read here. Do you think i should have low latency mode aswell, since i’m using freesync and not gsync?

I mainly play destiny 2 if that matters.

Thanks again!

jumphil
Member
jumphil

Shouldn’t the optimal settings include setting “Preferred refresh rate” which you mention on page 1 to “Highest available”? Battle(non)sense also recommends this

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