NVIDIA G-SYNC HDR is the latest iteration of the proprietary adaptive-sync or variable refresh-rate technology developed by the world’s largest GPU designer/manufacturer NVIDIA aimed primarily at eliminating screen tearing, input lag and the need for software alternatives such as v-sync and now also support 4K resolution at 144Hz with HDR10 and wide colour gamut.
G-SYNC technology eliminates screen tearing by forcing a monitor to adapt to the framerate of the GPU rather than the GPU adapting to the display’s fixed refresh-rate ie. 60Hz per se, which could traditionally be refreshed halfway through the process of a frame being output by the GPU, resulting in screen tearing, or two or more frames being shown at once. In order for a GPU to use G-SYNC feature, the monitor must contain a proprietary Altera FPGA based G-SYNC module supplied by NVIDIA to the display manufacturer.
Some of the first G-SYNC HDR monitors have begun to appear on the market, such as the ASUS ROG Swift PG27UQ and the Acer Predator X27, which has a 27″ display with an IPS panel in 3840×2160 resolution. They uses a super-bright LED backlight with 384 zones full-array local dimming combined with a quantum-dot enhancement filter to produce a maximum peak brightness of 1000 cd/m² and a contrast ratio of 50,000:1 in HDR mode along with vibrant colours.
A Typical NVIDIA G-SYNC HDR Gaming Monitor
Panel: 27″ AHVA (AU Optronics)
Resolution: 3840 × 2160 (163 PPI)
Refresh Rate: 4:4:4 HDR @ 98Hz, 4:2:2 HDR @120Hz (Native), 4:2:2 HDR @ 144Hz (Overclocked)
Variable Refresh-Rate Technology: NVIDIA G-SYNC HDR FPGA Module ($500+ BOM Cost)
Response Time: 4.0 Milliseconds
Brightness: 600 cd/m² (Typical), 1000 cd/m² (Peak)
Contrast Ratio: 1000:1 (SDR), 50000:1 (HDR)
Backlit Technology: FALD (384 Zones, QDEF)
HDR Standard: HDR10
Viewing Angles: 178°
Colour Depth: 10-Bit / 1.07 Billion (8-Bit+FRC)
Gamut Coverage: 90% DCI-P3, 99% Adobe RGB, 100% sRGB
Ports: 1 × DisplayPort 1.4, 1 × HDMI 2.0
Power Consumption: 180W (HDR)