G-SYNC 101: G-SYNC Ceiling vs. FPS Limit


How Low Should You Go?

Blur Busters was the world’s first site to test G-SYNC in Preview of NVIDIA G-SYNC, Part #1 (Fluidity) using an ASUS VG248QE pre-installed with a G-SYNC upgrade kit. At the time, the consensus was limiting the fps from 135 to 138 at 144Hz was enough to avoid V-SYNC-level input lag.

However, much has changed since the first G-SYNC upgrade kit was released; the Minimum Refresh Range wasn’t in place, the V-SYNC toggle had yet to be exposed, G-SYNC did not support borderless or windowed mode, and there was even a small performance penalty on the Kepler architecture at the time (Maxwell and later corrected this).

My own testing in my Blur Busters Forum thread found that just 2 FPS below the refresh rate was enough to avoid the G-SYNC ceiling. However, now armed with improved testing methods and equipment, is this still the case, and does the required FPS limit change depending on the refresh rate?

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

As the results show, just 2 FPS below the refresh rate is indeed still enough to avoid the G-SYNC ceiling and prevent V-SYNC-level input lag, and this number does not change, regardless of the maximum refresh rate in use.

To leave no stone unturned, an “at” FPS, -1 FPS, -2 FPS, and finally -10 FPS limit was tested to prove that even far below -2 FPS, no real improvements can be had. In fact, limiting the FPS lower than needed can actually slightly increase input lag, especially at lower refresh rates, since frametimes quickly become higher, and thus frame delivery becomes slower due to the decrease in sustained framerates.

As for the “perfect” number, going by the results, and taking into consideration variances in accuracy from FPS limiter to FPS limiter, along with differences in performance from system to system, a -3 FPS limit is the safest bet, and is my new recommendation. A lower FPS limit, at least for the purpose of avoiding the G-SYNC ceiling, will simply rob frames.



987 Comments For “G-SYNC 101”

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hramulka
Member
hramulka

Hello! Please review the settings for low latency mode. Since the release of the new driver 451.48 low-latency ultra + V-Sync mode does not automatically limit the number of frames, as it was previously (for example, on a 144 Hz monitor, the limit was set to 138), and the question arises, if you enable G-Sync + V-Sync + low-latency ultra mode, how much does it cost to limit FPS now???

nourboghdady
Member
nourboghdady

g sync don’t shown in Control Panel
my vga card is gtx 760
my monitor is G-SYNC Compatible
what can i do ??

compddd
Member
compddd

My monitor is 144Hz but if I’m playing a game like Sekiro Shadows Die Twice which has a max FPS limit of 60 due to being a console port, do I set my FPS limiter to 57 FPS for that game in RTSS?

darknightbacca
Member
darknightbacca

Sekiro has a mod that unlocks the FPS to any framerate you want above 60,

search up “Sekiro Fps Unlock And More” it’s on the Sekiro Nexus

Your welcome.

svatt
Member
svatt

Hi guys, i have bunch of problems with freesync.
My pc: r5 3600, rtx 2070, 144hz freesync monitor

My problem is that normally when i turn on gsync compatible in NVCP(i also turn on gsync indicator) its not working games are just stuttering and indicator is not showing, BUT when i go to any game properties and i disable thing called “disable fullscreen optimalisation” gsync compatible(“freesync”) starts working and indicator start showing but im noticing heavy flickering(i know its normal in loading screen but im noticing it like every 10sec. in game playing). okay so that is my first problem, second is why when i restart my computer and i have enabled gsync compatible but NOT DOING that thing in game properties(disabling fullscreen optimalisation) gsync compatible just starts working and again with high flickering.
Gsync compatible is just sometimes working and sometimes not after restarting pc. I go to the shop where i buy monitor and they replace monitor for the same model but problem is stil here. Is there any way to slove it or i must buy certified Gsync compatible monitor wich is in Nvidia list or is there problem in any hardware part like GPU or MB?

thanks for any help and sorry for my english but im from slovakia.

Jhaniel
Member
Jhaniel

So GSYNC ON, VSYNC ON. In game settings VSYNC OFF and cap fps to 141 if I have a 144hz monitor? Anything else TIA

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