ASUS ROG Strix XG49VQ Monitor review

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HDR Nits Explained - FreeSync / G-Sync

HDR 10 and nits

Better pixels, a wider color space, more contrast will result in more interesting content on that screen of yours. FreeSync 2 and the G-Sync enabled with HDR10 support built in, require for a display panel with the label to offer full 10bpc support. High-dynamic-range will reproduce a greater dynamic range of luminosity than is possible with digital imaging. We measure this in nits, and the number of nits for UHD screens and monitors is going up. Candle brightness measured over one meter is 1 nit, also referred to as Candela; the sun is 1.6000.000.000 nits, typical objects have 1~250 nits, current pc displays have 1 to 250 nits, and excellent non-HDR HDTVs offer 350 to 400 nits. An HDR OLED screen is capable of 500 to maybe 700 nits for the best models and here it’ll get more important, HDR enabled screens will go towards 1000 nits with the latest LCD technologies. HDR allows high nit values to be used. HDR had started to be implemented back in 2016 for PC gaming, Hollywood has already got end-to-end access content ready of course. As consumers start to demand higher-quality monitors, HDR technology is emerging to set an excitingly high bar for overall display quality.


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Really good HDR capable panels are characterized by:

  • Brightness between 600-1200 cd/m2 of luminance, industry goal is to reach 1000 to 2000
  • Contrast ratios that closely mirror human visual sensitivity to contrast (SMPTE 2084)
  • And the DCI-P3 and/or Rec.2020 color gamut can produce over 1 billion colors at 10 bits per color

HDR video and gaming increase vibrancy in colors, details with contrast and luminosity ranges with brightness. You will obviously need a monitor that supports it as well as a game title that supports it. HDR10 is an open standard supported by a wide variety of companies, which includes TV manufacturers such as LG, Samsung, Sharp, Sony, and Vizio, as well as Microsoft and Sony Interactive Entertainment, which support HDR10 on their PlayStation 4 and Xbox One video game console platforms (the latter exclusive to the Xbox One S and X). Dolby Vision is a competing HDR format that can be optionally supported on Ultra HD Blu-ray discs and from Streaming services. Dolby Vision, as a technology, allows for a color depth of up to 12-bits, up to 10,000-nit brightness, and can reproduce color spaces up to the ITU-R Rec. 2020 and SMPTE ST-2084. Ultra HD (UHD) TVs that support Dolby Vision include LG, TCL, and Vizio, although their displays are only capable of 10-bit color and 800 to 1000 nits luminance. The maximum range of colors reproducible by the monitor, generally expressed as the percent coverage of a defined standard like sRGB, Adobe RGB, DCI-P3, and BT.2020. These each specify a “color space,” or a portion of the visible spectrum, that delivers a consistent viewing experience between different imaging devices like monitors, televisions, and cameras. HDR10 requires displays cover at least 90% of the DCI-P3 color gamut (which is a subset of the currently unachievable BT.2020 color gamut).  


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Another way to interpret color gamuts are their coverage of Pointer’s gamut, a collection of all diffuse colors found in nature. Expanding a color space to include or extend beyond Pointer’s gamut will allow for richer and more natural imaging, as human vision is capable of interpreting many artificial colors beyond Pointer’s gamut that are commonly found in manufactured goods like automobile paints, food dyes, fashionable clothing, and Coca-Cola’s signature red. Think big and a lot of bandwidth. Monitor resolutions are expanding. A problem with that is that the first 8K monitors needed multiple HDMI and or DisplayPort connectors to be able to get a functional display. Alright, we've got the basics covered, let's move onwards into the review.


FreeSync / G-Sync

The monitor supports both FreeSync as well as G-Sync adaptive sync technology. NVIDIA recently did a 180-degree turn and started to support adaptive sync. For NVIDIA this works on the 10 and 20 series or newer graphics cards. We tested, and it works on this monitor.


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