G-SYNC 101: Hidden Benefits of High Refresh Rate G-SYNC


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Often overlooked is G-SYNC’s ability to adjust the refresh rate to lower fixed framerates. This can be particularly useful for games hard-locked to 60 FPS, and has potential in emulators to replicate unique signals such as the 60.1Hz of NES games, which would otherwise be impossible to reproduce. And due to the scanout speed increase at 100Hz+ refresh rates, an input lag reduction can be had as well…

Blur Buster's G-SYNC 101: Input Lag & Optimal Settings

The results show a considerable input lag reduction on a 144Hz G-SYNC display @60 FPS vs. a 60Hz G-SYNC display @58 FPS with first on-screen reactions measured (middle screen would show about half this reduction). And while each frame is still rendered in 16.6ms, and delivered in intervals of 60 per second on the higher refresh rate display, they are scanned in at a much faster 6.9ms per.



1716 Comments For “G-SYNC 101”

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Joselaba97
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Joselaba97

Just wanted to say thank you for the prolonged work and research you’ve been putting into your findings.

I have some questions and concerns regarding, multi-display configurations utilizing discordanant refresh rates, while one of them being gsync compatible, and also while utilizing DX12 applications with OBS game capture. I’ve also noticed that a good amount of DX12 games have been implementing reflex and other gsync compatibility optimizations as well, so this has expanded the amount of variables to consider for minimal input latency implementations.

For Gears 5, I utilize the NVCP vsync, the internal frame cap system (144 fps), gsync-compatible: full-screen mode only, and the reduced buffering option. However, I’m concerned as to what gsync and vysnc implementation should be used together, specifically the full-screen/full-screen & windowed mode and ON, OFF, Fast, and 3D application setting, respectively. I often stream the game and have noticed a considerable amount of input lag w/ occasional stutters with that concurrent configuration, regardless of the fact that it should be the configuration with the least amount of input lag. I’ve considered that it’s probably due to the secondary 60Hz monitor, but that is essential since it’s utilized to monitor chat and other related tasks while gaming on my 240Hz g-sync compatiable monitor. I also minimize OBS to the system tray in order to ensure that no hardware-accelerated tasks are interfering with the actively rendering game and its respective frame-pacing system.

Also, given that Nvidia has begun implementing optimizations for LLM and gysnc & vsync, is ULLM an option to consider regardless of the RB setting in-game?
Is there something that I have personally overlooked w/ respect to NVCP and the game?
Should I consider using the fixed refresh rate instead? (240Hz, I currently have the NVCP set to Prefer highest refresh rate)
Are there any setting recommendations that you would recommend for my current application? (w/ respect to windows settings, NVCP, and in-game)

Conclusively, gsync has been more of a headache to handle with rather than a “cool” optimization to use in-game. So I ask if you could please provide me with any information regarding my current application and optimization suggestions. Thank you

grumpycalabi314
Member
grumpycalabi314

Hi! First of all thanks for all the work you do. I noticed that if i play Battlefield (4 or 1) and if i set an FPS cap to 138 via NVCP, the game doesn’t feel quite right. I also noticed that the in-game fps counter (perfoverlay.drawfps 1) isn’t really stable (it stays a lot a 139, and jumps even at 141). On the other end, if i set an ingame fps limiter (gametime.maxvariablefps 138), the ingame fps counter is much more stable, always stays at 138 and the game feels much better. Have you done some testing on the frostbite engine to confirm or not this?
PS: VSYNC was set to ON via NVCP
Thanks you for the help.

chron42
Member
chron42

Hi, if I globally set the “Max frame rate” in Nvidia Control Panel to 141 (-3 FPS to my refresh rate), will this introduce the <1 Frame Delay to games where an in-game FPS limiter is available? (Using the in-game limiter I also set the game to max 141 FPS)

Niko
Member
Niko

Hello there, i play destiny 2 a lot and i cant seem to fix this weird stutter i play on a 1080ti and a 8700k oc to 5.0ghz with a 180 hz asus gsync monitor i have all my settings on low and i have gsync enables vsync enabled in nvcp and reflex on in the cvar files, the game just does not feel smooth reflex caps it to about 171 and it just bounces around between 145-171 its super frustrating

NNSLKPTIS
Member
NNSLKPTIS

Hello, sry for my engl. I have a Alienware aw2521hf 240hz and 1070. Usually Im playing Warzone. Please help me with settings for lowest input lag.
NVCP G-sync on
NVCP V-SYNC on.input lag is more lower then off right ?
nvidia reflex on + boost
should I use NVCP low latency mode? because game support nvidia reflex.
and limit maximum refresh rate in game 237 or nvcp 237 ? my fps around 90-110.
Thanks you for the help.

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