“Nvidia G-Sync”的意思、由来-开放百科全书

G-Sync is a proprietary adaptive sync technology developed by Nvidia aimed primarily at eliminating screen tearing and the need for software alternatives such as Vsync.^[1] G-Sync eliminates screen tearing by allowing a video display to adapt to the frame rate of the outputting device (graphics card/integrated graphics) rather than the outputting device adapting to the display, which could traditionally be refreshed halfway through the process of a frame being output by the device, resulting in screen tearing, or two or more frames being shown at once.^[2] In order for a device to use G-Sync, it must contain a proprietary G-Sync module sold by Nvidia. AMD (Advanced Micro Devices) has released a similar technology for displays, called FreeSync, which has the same function as G-Sync yet is royalty-free.

NVIDIA built a special collision avoidance feature to avoid the eventuality of a new frame being ready while a duplicate is being drawn on screen (something that could generate lag and/or stutter) in which case the module anticipates the refresh and waits for the next frame to be completed.^[3]

Overdriving pixels also becomes tricky in a non-fixed refresh scenario and solutions predicting when the next refresh is going to happen and accordingly adjusting the overdrive value must be implemented and tuned for each panel in order to avoid ghosting.^[4]

Hardware

The module carries all the functional parts. It is based around an Altera Arria V GX family FPGA featuring 156K logic elements, 396 DSP blocks and 67 LVDS channels. It's produced on the TSMC 28LP process and paired with three DDR3L DRAM chips to attain a certain bandwidth, for an aggregate 768MB capacity. The employed FPGA also features a LVDS interface to drive the monitor panel. It's meant to replace common scalers and be easily integrated by monitor manufacturers, who only have to take care of the power delivery circuit board and input connections.

GPU and system requirements

Criticism

G-Sync faces some criticism{{Who|date=January 2017}} due to its proprietary nature, and the fact that it's still being promoted when free alternatives exist, such as the VESA standard Adaptive-Sync which is an optional feature of DisplayPort version 1.2a.^[7] While AMD's FreeSync relies on the above-mentioned optional component of DisplayPort 1.2a, G-Sync requires an Nvidia-made module in place of the usual scaler in the display in order for it to function properly with select Nvidia GeForce graphics cards, such as the ones from the Kepler microarchitecture (GTX 650Ti and later).

List of G-Sync-enabled monitors

List of upcoming G-Sync-enabled monitors

List of G-Sync enabled GPUs

G-Sync Notebook

Nvidia announced that G-sync will be available to notebook manufacturers and that in this case, it would not require a special module since the GPU is directly connected to the display without a scaler in between.

According to Nvidia, fine tuning is still possible given the fact that all notebooks of the same model will have the same LCD panel, variable overdrive will be calculated by a shader running on the GPU, and a form of frame collision avoidance will also be implemented.^[10]

"Big Format" Gaming Displays

At CES 2018 Nvidia announced a line of large gaming monitors built by HP, Asus and Acer with 65 inch panels, 4k, HDR, as well as G-sync support. The inclusion of G-sync modules make the monitors among the first TV-sized displays to feature variable refresh-rates.^[11]

See also

References

1. ^{{cite web|url=http://www.cnet.com/news/nvidia-g-sync-is-a-smooth-move-for-pc-games/|title=Nvidia G-Sync is a smooth move for PC games|publisher=CBS Interactive|work=CNET|accessdate=21 March 2015}}
2. ^{{cite web|url=http://www.gamespot.com/articles/review-nvidia-g-sync-makes-your-pc-games-look-amaz/1100-6424349/|title=Review: Nvidia G-Sync Makes Your PC Games Look Amazing|work=GameSpot|accessdate=21 March 2015}}
3. ^{{cite web|title=Trouble brewing? What happens at the edges?|author=Scott Wasson|date=13 April 2015|work=The Tech Report|url=http://techreport.com/review/28073/benq-xl2730z-freesync-monitor-reviewed/3|accessdate=11 June 2015}}
4. ^{{cite web|title=Nvidia announces G-Sync for laptops, reveals low-level tech details|author=Mark Walton|date=1 Jun 2015|work=Arstechnica|url=http://arstechnica.co.uk/gadgets/2015/06/nvidia-announces-g-sync-for-laptops-reveals-low-level-tech-details/|accessdate=11 June 2015}}
5. ^{{cite web|url=https://devtalk.nvidia.com/default/topic/751890/unix-graphics-announcements-and-news/linux-solaris-and-freebsd-driver-340-17-beta-/|title=Linux, Solaris, and FreeBSD driver 340.17 (beta)|author=Aaron Plattner|website=devtalk.nvidia.com|date=9 June 2014|accessdate=18 January 2017}}
6. ^{{cite web|url=http://www.geforce.com/hardware/technology/g-sync/system-requirements|title=G-SYNC System Requirements|author=NVIDIA|website=geforce.com|accessdate=16 January 2017}}
7. ^{{cite web|url=http://techreport.com/news/26451/adaptive-sync-added-to-displayport-spec|title=Adaptive-Sync added to DisplayPort spec|author=Scott Wasson |date=12 May 2014|work=The Tech Report|accessdate=29 May 2015}}
8. ^{{cite web|title=G-SYNC-ready Monitors|author=NVIDIA|website=geforce.com|url=http://www.geforce.com/hardware/technology/g-sync/where-to-buy-g-sync-monitors-and-modules|accessdate=16 January 2017}}
9. ^{{cite web|url=http://www.geforce.com/hardware/technology/g-sync/supported-gpus|title=Supported GPUs|author=NVIDIA|work=geforce.com|accessdate=25 June 2016}}
10. ^{{cite web|title=Nvidia announces G-Sync for laptops, reveals low-level tech details|author=Mark Walton|date=1 Jun 2015|work=Arstechnica|url=http://arstechnica.co.uk/gadgets/2015/06/nvidia-announces-g-sync-for-laptops-reveals-low-level-tech-details/|accessdate=11 June 2015}}
11. ^{{Cite news|url=https://www.techhive.com/article/3247424/ces/best-smart-tv-at-ces-is-from-nvidia.html|title=The best smart TV at CES is this giant Nvidia gaming display|work=TechHive|access-date=2018-01-11|language=en}}