NVIDIA G-Sync: what is it and how does it work

NVIDIA has recently introduced its new technology G-Sync, and considering the few details that are noted in this regard that we have found it necessary to write this little article to explain in the simplest way possible, this new technology, what it is and how it works.
So far, everyone knew that the vertical sync (VSync), whereby for a monitor which works at a frequency of 60 Hz update, means that the graphics card has render 60 FPS for a gaming experience and vision. This is why they are so popular, that graphic design makes each frame in line with the refresh rate of the monitor you are using FPS games. Obviously, this is an ideal situation and in 90% of situations don’t get to meet at all because two feared effects: stammering and tearing (don’t worry now explain what are both phenomena).

What happened to G-Sync?

The graphics card is always trying to throw as many frames per second as you can, but as you know even though we have a few FPS optimal configured, these actually vary, say between 30 and 80 FPS. The graphic makes a number of FPS. With regard to what we see, or more although the human eye can see, this is not too obvious thanks to the refresh rate of the monitor (we are going to continue with the example of 60 Hz). So we have to render graphics card frames with a floating rate and the monitor is full sync it to a value equal to its frequency static update. Namely, that if our monitor running at 60 Hz, the ideal frames shown are 60 FPS, but this is so given to graphics makes a FPS speed variable, dynamic. This is called stuttering. This causes an additional problem when making graphics less than 60 FPS, because the FPS is able to process varies greatly depending on the load stage of the game that we are running. This creates the so-called tear effect.

Tearing

So far, these two problems is solved basically in two ways. The first is simply ignore the refresh rate of the monitor and let render graphics card how many frames per second as possible, i.e., disabling vertical sync. In the picture below you can see the actual effect may have, where in a single cycle of the monitor updates the two images are showing and creates a clear line between the two.

The solution for the tearing is to activate vertical synchronization (VSync) to force the graphics card slows the monitor start updates until this update cycles. But of course, this delay causes stuttering when the GPU is unable to render these 60 frames per second and also increases the latency (response time), also called input lag.

That is, whether we have snags or stuttering. This is the reason why players always want a more powerful graphics card to ensure that it is able to process at least 60 FPS in all games and at all times. VSync enabled, we will have only minimal peaks of stuttering.

The solution is NVIDIA G-Sync.

Once explained the current problems, NVIDIA offers his solution: G-Sync. A dynamic rhythm looms have made for graphics cards, while the monitor displaying the images on a static refresh rate. Monitors that come with this additional hardware (already noted what is physically G-Sync) are automatically converted into “slaves” of the graphics card, which allows you to use it to control your monitor’s refresh rate, i.e., that becomes dynamic as well as the FPS. In this way, whenever the graphics rendering a frame, it automatically aligns with the refresh rate of the monitor, that is, both will be in constant sync, then is removed completely and stuttering as the laceration.

But that’s not all. No stutter or tearing, even on LCD monitor with 30 Hz refresh rates game experience is optimum. In fact, high-end monitors running at 177Hz will also have support for G-Sync and new generation with 4 k resolution monitor.

And this is a problem?

Actually only one and that is the graphics card, tell us, ‘ slow ‘ and cannot make it somehow more than 10 FPS, the game will look really weird. Imagine that we have at any given time in a FPS game 4 only because our graphics is not able to make faster frames. The game will be more or less like a powerpoint presentation. For this reason, it is only recommended for medium-high range minimum G-Sync. That, or you can always configure game graphics settings to try to ensure a minimum FPS (remember that the human eye is capable of capturing an average of between 28 and 34 frames per second).


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