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V-sync is a term you may have heard if you're a pc gamer or a techie person. V-sync works by delaying the image frame update until the vertical blanking interval of display, in other words video card shoves new images to the monitor as quickly as it can and the monitor in turn updates as quickly as it can, with no regard for weather the image is fully synced at the top and bottom, V-sync fixes this by limiting the upper frame rate.

While this does eliminate screen tearing, it causes performance issues with low frame rate and a jerky mouse response. Thus many gamers tend to disable this in order to get higher frame rate and response at lower visual quality.
The LCD monitors available today usually have a fixed refresh rate of 60Hz and unless the GPU is aiming other than 60FPS, the result is inferior.
This is where NVIDIA's G-Sync comes in. G-sync is a physical chip that integrates directly into a monitor. According to NVIDIA G-sync synchronizes the graphics card to the monitor, rather than the monitor to the Graphics card. Unlike V-sync, G-sync works by having a variable display refresh rate. This Tech lets the display alter its refresh rate to whatever the GPU is sending, instead of delaying frames to match the display's refresh rate. This means the display is always in lockstep with the GPU, refreshing only when a new frame is sent.
Thanks to this perfect synchronization the result is extremely smooth graphics, even if you are not exactly playing at insane frame rates, with no visual artifacts.
For G-sync to work, Firstly you must need a monitor with variable refresh rate. Secondly, you need the dedicated G-sync chip connected to the monitor that would work in tandem with your GPU, and lastly, you need a keplar based GPU (GTX 650 Ti Boost and above). Currently only the ASUS VG248QE monitor supports the G-sync module.
The module would be available later this year for around $175. The module will eventually be available for other monitors and you will be able to purchase monitors with it built-in. Resolution would vary from 1920x1080 to all the way up to 4K.
The cost a monitor with G-sync and a fairly powerful GPU will likely to be quite steep, so only the most hardcore gamers with deep pockets are going to consider this initially.
But sources confirmed that this Tech actually works and with brilliance. Oh I totally forgot to mention that G-sync is an NVIDIA only feature (that's a smart move). It is certain that AMD will answer this kind of project with their own initiative, possibly as an open-source initiative.
But till then its going to make some buzz for sure. If you're the sort of gamer who'd pay top dollar for the best visual experience G-sync should be included in your wish-list for this Christmas... :-)
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