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.”



3080 Comments For “G-SYNC 101”

This site uses Akismet to reduce spam. Learn how your comment data is processed.

Sort by:   newest | oldest | most liked
Adam Jensen
Member
Adam Jensen

Hi Jorimt,

I’m looking for a solution for a problem i have with my monitor. It’s a 120hz Freesync Display, that work great excpet that when i activate the G-Sync compatibility with display specific settings it’s lock my frame rate to 117 fps and induce flickering. But when i dont tick display specific setting it dont activate gsync and my fps are not capped.

I precise that i don’t have any FPS Capping setting in NVCP or somewhere else. I tried everything but it don’t work.

Thank you in advance for your reply !

Yezaen
Member
Yezaen

Isn’t freesync supposed to completly remove tearing? Monitor range is 40-165hz

To name a few, I’ve tryed d4 (rarely, but still ocassionally), starfield (alot) and ghostwire tokyo (not much, but I’m still able to catch some) tearing, unless I enable vsync.

This guide is tailored for nvidia, so I’m not sure it could be applied to amd cards too?

But even so, is not lfc applied to avoid that scenario?

msp
Member
msp

Hi

Diablo 4 on the PC only has 2 display options:
1) ”Windowed”
2) ”Windowed (Fullscreen)”

My question is if I need to set the G-SYNC option on the Nvidia Control Panel to ”Enable for windowed and full screen mode” or ”Enable for full screen mode” will suffice ?

I’d enable for both windowed and full screen mode just to make sure but it seems that doing so comes with some drawbacks to non-game apps.

I’m confused with this issue because Diablo 4 doesn’t mention ‘borderless fullscreen’ it just says ‘fullscreen’ so perhaps it behaves in such a way that nvidia control panel will detect it as a fullscreen application for the purpose of automatically enabling g-sync when we have it set to fullscreen mode only?

Flop
Member
Flop

I have a question about capping FPS: when G-SYNC + NVCP V-SYNC are enabled, Reflex will automatically limit the FPS, as well as Ultra Low Latency Mode. Either way, the FPS is capped so aren’t the steps about capping FPS with RTSS, an in-game limiter, or the “Max Frame Rate” setting irrelevant?

esgavrilov
Member
esgavrilov

Hello. Maybe someone will help me understand something. My setup: i9-13900K, RTX 4090, Alienware AW3423DW. In games Spider-Man (both Remastered and MM) with G-Sync On + VSync On + Reflex In-Game On – terrible microstutters every second with high fps (around 167 fps all the time). But when I turn off gsync, then game goes much better and very smooth with same high fps. No stutters at all. How can it be worse with GSync On? I don’t get it.

wpDiscuz