G-Sync and ULMB at the same time is in fact possible!
Posted: 12 Jun 2016, 03:06
Edit: There are easy known ways to enable it currently. The easiest one is making a custom resolution with +5 (or +1 if 5 doesn't work) Vertical Total than default (like 1530 or 1526 instead of 1525 for 1440p monitors), or doing the same for the base resolution using Custom Resolution Utility. Check the last pages of this thread to read some tests and confirmations.
tl;dr: synchronized single strobing between 40 and 120 fps. Lower than 40fps means double strobing. With some overclocking (check the ULMB at 60Hz thread: http://forums.blurbusters.com/viewtopic.php?f=4&t=3501), I could push it to 125Hz. With a 240Hz monitor, some user managed to do it up to 151Hz, IIRC.
List of confirmed monitors for now (as of 2017-10-03):
- Dell S2716DG
- Asus PG278QR
- Asus PG279Q
- Acer XB271HU
- ViewSonic XG2703-GS
- Dell S2417DG
- Acer Predator XB272
Video with Skyrim (DX9) working with it: https://www.youtube.com/watch?v=8Hj-GNztJfE
Video with G-Sync Pendulum demo: https://www.youtube.com/watch?v=e52T8d8mhfk
The video descriptions are outdated, with info about the old method.
Old content of my post, showing my first finding and shocked status :
What the thread title said. I could do it with my Dell S2716DG. The hard to get requirement for that is making the monitor be stuck in Lightboost (not ULMB) mode even if you try to disable it. That can happen if you have a 3D Vision 2 kit and play in 3D.
I can't say how to get into that state because I don't know how I did it, and after trying to replicate it I've failed, so I lost this secret G-Sync + ULMB mode.
I randomly decided to try Octodad with G-Sync (I hadn't used G-Sync for some time), so I enabled it in the Nvidia Control Panel (the monitor stayed at ULMB mode in desktop (not Lightboost)) and booted the game. "Hey, wtf? This is still strobing.... but wait! It's strobing at 60Hz!". The game is capped at 60fps and I reached the cap, so I didn't realize then what happened.
I was suspicious, so then I started playing Skyrim. And then I was really amazed. It was running in ULMB and synchronizing with the refresh rate! The image quality was perfect. No crosstalk, no tearing, no double image, no extra stuttering, etc. It was G-Sync but without motion blur. I think it synchronized perfectly down to around 30fps. I don't mind flickering, so 40fps with strobing has nothing wrong for me. Brightness was a bit variable, but not as much as you would expect.
Here is the video proof of that (Skyrim with unlocked fps), where you can see the variable strobing (recorded with my Samsung Galaxy S4 Mini camera at 30fps): https://www.dropbox.com/s/u1mhybhc7u2l2 ... b.mp4?dl=0
Around 90fps when looking at the sky (black bars rolling up in the video), and below 60fps when looking at the scenery (black bars rolling down). At exactly 60fps, the bard don't move in the video.
However, there are some things that make the monitor go into normal G-Sync, like games that force a refresh rate change at startup.
Games I tried that worked: Octodad, Skyrim, Castlevania LoS, The Witcher, The Vanishing of Ethan Carter Redux.
After that, I tried to replicate the unlocking of this mode but failed, because now Lightboost is behaving normal (disabling itself when I choose to only enable it in fullscreen applications). Maybe I shouldn't have done that. I would love if Nvidia let us enable this mode.
tl;dr: synchronized single strobing between 40 and 120 fps. Lower than 40fps means double strobing. With some overclocking (check the ULMB at 60Hz thread: http://forums.blurbusters.com/viewtopic.php?f=4&t=3501), I could push it to 125Hz. With a 240Hz monitor, some user managed to do it up to 151Hz, IIRC.
List of confirmed monitors for now (as of 2017-10-03):
- Dell S2716DG
- Asus PG278QR
- Asus PG279Q
- Acer XB271HU
- ViewSonic XG2703-GS
- Dell S2417DG
- Acer Predator XB272
Video with Skyrim (DX9) working with it: https://www.youtube.com/watch?v=8Hj-GNztJfE
Video with G-Sync Pendulum demo: https://www.youtube.com/watch?v=e52T8d8mhfk
The video descriptions are outdated, with info about the old method.
Old content of my post, showing my first finding and shocked status :
What the thread title said. I could do it with my Dell S2716DG. The hard to get requirement for that is making the monitor be stuck in Lightboost (not ULMB) mode even if you try to disable it. That can happen if you have a 3D Vision 2 kit and play in 3D.
I can't say how to get into that state because I don't know how I did it, and after trying to replicate it I've failed, so I lost this secret G-Sync + ULMB mode.
I randomly decided to try Octodad with G-Sync (I hadn't used G-Sync for some time), so I enabled it in the Nvidia Control Panel (the monitor stayed at ULMB mode in desktop (not Lightboost)) and booted the game. "Hey, wtf? This is still strobing.... but wait! It's strobing at 60Hz!". The game is capped at 60fps and I reached the cap, so I didn't realize then what happened.
I was suspicious, so then I started playing Skyrim. And then I was really amazed. It was running in ULMB and synchronizing with the refresh rate! The image quality was perfect. No crosstalk, no tearing, no double image, no extra stuttering, etc. It was G-Sync but without motion blur. I think it synchronized perfectly down to around 30fps. I don't mind flickering, so 40fps with strobing has nothing wrong for me. Brightness was a bit variable, but not as much as you would expect.
Here is the video proof of that (Skyrim with unlocked fps), where you can see the variable strobing (recorded with my Samsung Galaxy S4 Mini camera at 30fps): https://www.dropbox.com/s/u1mhybhc7u2l2 ... b.mp4?dl=0
Around 90fps when looking at the sky (black bars rolling up in the video), and below 60fps when looking at the scenery (black bars rolling down). At exactly 60fps, the bard don't move in the video.
However, there are some things that make the monitor go into normal G-Sync, like games that force a refresh rate change at startup.
Games I tried that worked: Octodad, Skyrim, Castlevania LoS, The Witcher, The Vanishing of Ethan Carter Redux.
After that, I tried to replicate the unlocking of this mode but failed, because now Lightboost is behaving normal (disabling itself when I choose to only enable it in fullscreen applications). Maybe I shouldn't have done that. I would love if Nvidia let us enable this mode.