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well for gsync to engage (and then possibly cause stutter and/or flicker) using the "Enable for full screen mode" option, without MPOs, the app would need to be an app using a flip model swapchain with a borderless fullscreen window using a resolution that matches the current monitor's resolution (and the app cannot have something external on top...)

i suppose the most likely type of apps in that scenario then would be some image viewer and editor apps in borderless fullscreen yeah... though i know some apps have started using driver profiles that disable gsync for themselves and/or use fractional vsync to disable vrr (i know the paint.net app, for example, sets gsync application state to force off in an app driver profile and was also using fractional vsync. photoshop last i checked didn't do either of those things though... and at some point i ended up using the nvidia profile inspector to set gsync application state to force off in a photoshop driver profile)

anyway, i suppose most people run their apps using a window that doesn't match the desktop resolution...

an issue is far more likely to happen with the "enable for windowed and full screen mode" option globally enabled.

i pretty much never recommend using the "enable for windowed and full screen mode" option even with a game-specific profile though honestly. it hasn't always synced well... and it doesn't get rid of the latency penalty from dwm composition... =(

granted some people may really want to play using a window with a resolution that doesn't match their desktop resolution... and not everyone has MPOs with their display. i suppose those people may want to try the "enable for windowed and full screen mode" in a game's driver profile and hope for the best.

Gias wrote: ↑

10 May 2025, 08:26

photoshop last i checked didn't do either of those things though... and at some point i ended up using the nvidia profile inspector to set gsync application state to force off in a photoshop driver profile

Same here. Whether I need the NVI profile shifts depending on the Photoshop or driver version for me, though. Feels random.

Gias wrote: ↑

10 May 2025, 08:26

i pretty much never recommend using the "enable for windowed and full screen mode" option even with a game-specific profile though honestly.

Its uses are limited, especially nowadays. I've only ever used it when there was no other choice, and that scenarios has been far and few between.

Gias wrote: ↑

10 May 2025, 08:26

it hasn't always synced well... and it doesn't get rid of the latency penalty from dwm composition... =(

It bypassed it in my original tests, but things could have changed (multiple times) since, of course:
https://blurbusters.com/gsync/gsync101- ... ttings/10/

Gias wrote: ↑

10 May 2025, 08:26

not everyone has MPOs with their display.

I'm one of those people; my current monitor (PG27AQN) uses aggressive levels of DSC at 1440p 360Hz, and does not support things like MPO, DSR, or custom resolutions unless I disable DSC and drop to 240Hz.

In fact, often when I attempt to launch a DX12 game in fullscreen or borderless in G-SYNC mode, my display looses signal (only the game sound plays) unless I press the Windows key, at which point the game window will show again beneath the Windows menu until I refocus it.

The only way to fix it is to force close the game, disable and re-enable G-SYNC in the NVCP, and then relaunch it.