Slashdot: DisplayPort 2.0 Labels Specify Bandwidth To Avoid HDMI 2.1-Like Confusion

DisplayPort 2.0 Labels Specify Bandwidth To Avoid HDMI 2.1-Like Confusion
Published on March 01, 2022 at 03:32AM
An anonymous reader quotes a report from Ars Technica: VESA, which makes the DisplayPort spec, today announced a certification program aimed at helping consumers understand if a DisplayPort 2.0 cable, monitor, or video source can support the max refresh rates and resolutions the spec claims. VESA's latest certification is around DisplayPort 2.0. The spec can support a max throughput of 80Gbps compared to DisplayPort 1.4's 32.4Gbps. This enables extreme uses, like 16K resolution with display stream compression (DSC), 10K without compression, or two 8K HDR screens at 120 Hz. But just because a monitor or cable, for example, is DisplayPort 2.0-certified doesn't mean that's the performance you'll get. The Ultra-high Bit Rate (UHBR) Certification is what you'll have to check for if you want to be certain about these figures. VESA's new "DP80 UHBR" certification means the display, cable, or video source supports up to a 20Gbps link rate (what VESA calls UHBR20) and a throughput of up to 80Gbps via four lanes. Meanwhile, "DP40 UHBR" certification calls for support for a 10Gbps link rate (UHBR10) and a maximum throughput of 40Gbps via four-lane operation. Of course, it's possible that some products will still claim such performance without going through VESA's certification process, but UHBR certifications seem to be the only way to know for sure if the DisplayPort 2.0 product will give you that impressive bandwidth. There should eventually be UHBR-certified monitors and video sources, but today's announcement is only accompanied by UHBR-certified cables. According to VESA, there are now DisplayPort and Mini DisplayPort DP40 and DP80 cables from companies including Accell, Bizlink, and WIZEN. The cables are also backward-compatible with other DisplayPort link rates, such as HBR 3 and 2. [...] In terms of DisplayPort over Alt Mode, VESA noted that "full-feature passive USB-C cables already support UHBR bit rate speeds." It added that UHBR-certified USB Type-C-to-DisplayPort converter cables will be available "soon." VESA also said that "multiple video source and display products" it's currently testing should be DisplayPort UHBR-certified "soon."

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