The new DisplayPort 2.1 standard is not only backwards compatible with 2.0 devices, but will also supersede it. All DP 2.0 products will be certified to use the stricter DP 2.1 spec as well.
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Intel is working to implement its DP MST technology for Linux that will allow users to connect up to three 4K 60Hz displays with their Intel Arc graphics powered PCs as soon as October.
Nvidia's new graphics cards, the GTX 1080 and 1070 may be the best than money can buy but they don't fully support the HTC Vive VR headset. The problems show up when using the Vive over DisplayPort.
