G-SYNC 101: External FPS Limiter HOWTO


In-game vs. External Framerate Limiters

As described in G-SYNC 101: In-game vs. External FPS Limiters, In-game framerate limiters, being at the game’s engine-level, are almost always free of additional latency, as they can regulate frames at the source. External framerate limiters, on the other hand, must intercept frames further down the rendering chain, which can result in delayed frame delivery and additional input lag; how much depends on the limiter and its implementation.

In-game framerate limiters, however, aren’t available in every game, and while they aren’t required for games where the framerate can’t meet or exceed the maximum refresh rate, if the system can sustain the framerate above the refresh rate, and a said option isn’t present, an external framerate limiter must be used with G-SYNC to prevent V-SYNC-level input lag instead.

RTSS is a CPU-level FPS limiter, and introduces up to 1 frame of delay, whereas Nvidia Inspector uses a driver-level FPS limiter, which introduces 2 or more frames of delay. See G-SYNC 101: In-game vs. External FPS Limiters for complete details, along with input latency tests comparing the two external solutions against an in-game limiter.

RivaTuner Statistic Server: <1 Frame Delay

RTSS is available standalone here, or bundled with MSI Afterburner here.

If only a framerate limiter is required, the standalone download will suffice. MSI Afterburner itself is an excellent overclocking tool that can be used in conjunction with RTSS to inject an in-game overlay with multiple customizable performance readouts.

Blur Buster's G-SYNC 101: External FPS Limiter HOWTO

RTSS can limit the framerate either globally or per profile. To add a profile, click the “Add” button in the lower left corner of the RTSS windows and navigate to the exe. To set a frame limit, click the “Framerate limit” box and input a number.

Nvidia Inspector: 2> Frame Delay

An unofficial extension of the official Nvidia Control Panel, Nvidia Inspector (download here) exposes many useful options the official control panel does not, including a driver-level framerate limiter.

Nvidia Inspector can limit the framerate either globally or per profile (more details on profile creation can be found here).

To set a frame limit, locate the “Frame Rate Limiter” dropdown in the “2 – Sync and Refresh” section, select the desired limit, and then click the “Apply Changes” button in the upper right corner of the Nvidia Inspector window.

Blur Buster's G-SYNC 101: External FPS Limiter HOWTO

As of Nvidia Profile Inspector version 2.1.3.6 and Nvidia driver branch R381 or later, a new “Frame Rate Limiter Mode” dropdown has been introduced with a “Limiter V2 – Force Off” option:

Blur Buster's G-SYNC 101: External FPS Limiter HOWTO

This option claims to reduce the limiter’s input lag; exactly by how much, and with what combination of settings, remains to be determined.



977 Comments For “G-SYNC 101”

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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?

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

DeepskyScorpion
Member
DeepskyScorpion

I would like to ask if the behaviour of VSYNC with GSYNC enabled on an Nvidia GPU — where the module deals with frame time variance better and doesn’t allow suddent changes in frame time to introduce tearing — applies to Freesync monitors, with GPU from both venders? Or do the GPU and/or the display treat it differently depending on the venders of both components?

stollywood
Member
stollywood

Hi there,

Great article!!

I have 8700k and 2080ti and when running at 1440p on high settings I’m having some stuttering So tried to run gysnc on, vsync on (nvc), llm on & and in game limiter 3fps under my 144hz refresh.

Problem is im hitting 100% gpu usage when i look in. Hw monitor when play destiny 2 and COD MW.

What is the best thing to do?

I have changed some options in nvidia control via some other guides and not sure if that is causing it.

Surely my gpu being 2080 ti sound run under 100% all all of the time. Temps are around 82oC max

Cheers Ryan

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