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.”



1360 Comments For “G-SYNC 101”

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BlackStorm82
Member
BlackStorm82

Hello.

GSYNC ON 240Hz / LLM ON
GPU 50% FPS 150FPS

NO GSYNC 240Hz / LLM ULTRA
GPU 50% FPS 150FPS

In both situations, which is the lower inputlag?

hramulka
Member
hramulka

Good day! I am tormented by this question: Should I disable HPET in the BIOS??? Will HPET somehow affect the operation of G-Sync or the entire system as a whole if HPET is disabled in the BIOS? In my case, Ryzen 5 2600 and RTX 2070. Thank you in advance!

r1cko
Member
r1cko

Hey, i have an issue.

I am running: G-Sync ON + VSync ON in NVCP + VSync OFF in game (Fortnite) + i capped my fps at 237 and i only get 225 fps. If i turn the VSync from NVPC off, i get 237.
My monitor is an Alienware AW2521HF.
Any idea why is this happening?

Edit: I just tested Valorant. WIth fps capped to 237, i get 225 aswell. 🙁

adamzo
Member
adamzo

@jorimt!
Hello there!

So I have a question, I have been having issues recently, the problem that I have is as follows.

I have 4 monitors, Main: Acer predator 27 inch xb271hu 165hz 1440p G-Sync Monitor, A 27 inc Acer xf240h 144hz monitor, and a Asus vg248qe 24 inch 144hz monitor, and a AOC 60hz 27 inch monitor.

I have been using this without any problems what so ever before, but just recently I started having problems in games with tearing/stuttering. I have set my main G sync monitor to my primary monitor, I have the latest nvidia drivers, (tried earlier ones aswell) I have G sync enabled in NVCP In fullscreen mode, I have all my monitors refresh rates set at their highest, I have G-Sync/V sync ON in global settings, I have capped my FPS in NVCP at 162/160/150/140 with same results, I get tearing/stuttering either way, specially with CSGO, where I now also can feel a huge amount of delay when moving around aswell as the stutter/tearing, wich was never there before. I even reinstalled windows to be sure without any success. I have also tried without V-SYNC, Only G sync, same results. I have no clue what the problem can be, any help would be HUGELY appriciated. and I would even go as far as paying if I could get this problem resolved one way or another, I’am a competitve gamer, wich really need to be able to play, since I have a team I play for etc, so I’am desperate to get this working somehow 🙁

System information : GPU GTX 1080 TI , CPU I7 8700K 32GB G-skill trident-z 3200mhz ram. 1000W PSU.

alfredo8989
Member
alfredo8989

Hi

-Is it better to limit the frame rate with Rtss or in game (if possible)? Which of the 2 adds the least lag?
– The reflex mode limits my fps to 138 (I have 144hz monitor), so it is no longer necessary to limit the fps in the game or with rtss? I use gsync vsync on driver and -3fps cap.
– In games where reflex mode is not supported I use low latency mode in the drivers.
Su does not limit fps, while ultra yes to 138.
But 138 fps limits them using nvidia drivers right? So it adds 2 fps of delay or more, so is it better to just use and limit with rtss in order to have only 1 fps of delay?
Thanks for the answers.

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