在一个技术专家博客下面也谈到这个贝尔金
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kuba October 12th, 2020 6:16 am
This new Anker hub claims to achieve 4k@60Hz using DP1.4
https://www.anker.com/products/variant/powerexpand-8in1-usbc-pd-10gbps-data-hub/A83830A1Steve October 12th, 2020 7:40 am
The USB-C video options were already very confusing, and now they’re even more so. Yes, according to the specs, the latest DisplayPort 1.4 standard can deliver 4K 60Hz video using only two lanes with HBR3. This should make it possible to get 4K60 video and USB 3.1 ports in the same hub, but only if the computer, hub, and monitor all support DisplayPort 1.4 and HBR3. Even though DP1.4 was introduced in 2016, support for anything beyond DP1.2 was uncommon at the time I wrote this article. Both my computer and my monitor are limited to DP1.2. Today DP1.4 support is becoming more common.
Page 18 of this VESA doc has some helpful info:
https://www.vesa.org/wp-content/uploads/2016/10/USB-DevDays-DisplayPort-Alternate-Mode-2016-final4.pdfA footnote: I think HBR3 was actually introduced with DisplayPort 1.3, so 4K 60Hz video using only two lanes was technically possible then. But DP1.3 didn’t seem to be very popular in the marketplace, in my limited searching of computers and monitors. 4K60 video using two lanes with DP1.3 was also limited to 24 bits per pixel color. DisplayPort 1.4 introduced a new compression technology called DSC, and the combination of HBR3 and DSC in DisplayPort 1.4 enables 30 bits per pixel color with 4K60 video using two lanes.
For completeness’ sake, I should point out that the latest DisplayPort version is actually 2.0, not 1.4. But as of today (October 2020), DP1.4 remains the latest version you’re likely to find in any computer or monitor in the marketplace. DP2.0 will become more relevant in the future.
