As technology innovation marches forward, new kinds of devices, media formats, and large inexpensive storage are converging. They require significantly more bandwidth to maintain the interactive experience users have coe to expect. In addition, user applications demand a higher performance connection between the PC and these increasingly sophisticated peripherals. Super Speed USB addresses this need by adding an even higher transfer rates to match these new usages and devices.
DisplayPort 2.0 offers 80Gb of bandwidth, or 2.46x as much as DisplayPort 1.3/1.4. Effective bandwidth is 77.37Gbps, up from 25.92Gbps, an increase of 2.98x. The reason the effective gain is larger than the theoretical standard gain is because of additional efficiency baked into the data encoding standard, which allows DP2.0 to use a higher percentage of its theoretical bandwidth.
DisplayPort (DP) 2.0 is the newest specification released by VESA (Video Electronics Standards Association) in June 2019. This new release comprises of a number of new features and upgrades from the previous DisplayPort 1.4 spec. Let’s get to know the differences between DisplayPort 1.4 vs DisplayPort 2.0, and learn what we can expect with the latest release.
Upgrading to DisplayPort 2.0
While DisplayPort 1.4 has its stake in the market, we will soon be seeing a wider adoption of the latest DisplayPort 2.0 spec from many companies. What can we expect with the newest release?
DisplayPort 2.0 introduces three different bit rates per lane over four lanes, including 10Gbps, 13.5Gbps, and 20Gbps. This means that DP 2.0 can in theory triple its max link bandwidth up to 80 Gbps. However, at this time, VESA is focusing on creating passive cables supporting UBHR 10 (Ultra High Bit Rate), delivering a total of up to 40 Gbps. By increasing the bandwidth to this length, it is stated by VESA, that “DP 2.0 is the first standard to support 8K resolution (7680 x 4320) at 60 Hz refresh rate with full-color 4:4:4 resolution, including with 30 bits per pixel (bpp) for HDR-10 support.”
While the physical plugs and backward-compatibility aren’t changing, DP2.0 is actually being implemented using USB-C and Thunderbolt 3, which Intel released royalty-free earlier this year. As a result, both USB4 and DisplayPort 2.0 will be implementations of Thunderbolt under the hood. Where TB is designed to provide bi-directional links of 40Gbps (four wires in two pairs, with each wire capable of sending 20Gbps and one pair for inbound versus outbound communications), DisplayPort only needs to concern itself with one direction of transmission.
All four Thunderbolt connections, therefore, are devoted to transmission, and voila — 80Gbps of signal. This is part of where DisplayPort’s efficiency gain comes from — the move to 128/132-bit signaling reduces overhead substantially compared with DP1.0-1.4, which used 8/10-bit signaling. This is similar to the step PCIe 3.0 took to boost efficiency over PCIe 2.0 years ago.
Cable replacements, however, may be required. DP2.0 introduces three bit rates per lane, at 10Gbps, 13.5Gbps, and 20Gbps. Currently, there are plans to build passive cables for the UHBR 10 standard, which delivers 40Gbps or half the bandwidth that the standard theoretically supports. Any DP cables you see marked 8K ready are UHBR 10 and should conform to the link’s requirements.
For now, however, VESA hasn’t sketched out anything past this. Active cabling may be required to push the kinds of 10K – 16K displays that DP2.0 will theoretically support.
Once-optional features like Forward Error Compression and Panel Replay are now mandatory (Panel Replay is an advanced form of Panel Self Refresh). Adaptive-Sync, however, will remain an optional feature. Manufacturers are not required to support it.
Ordinarily, there’s a substantial lag between when a new standard is available and when GPUsSEEAMAZON_ET_135 See Amazon ET commerce pick it up, but the fact that DisplayPort 2.0 is based on Thunderbolt could speed overall adoption.
DP2.0 packs enough bandwidth to allow for native 8K support without any kind of colour compression or chroma subsampling. Even HDR can be supported with this kind of bandwidth jump. Up to 16K panels can now be connected with DP2.0 and DSC compression, while 10K@60Hz with 24-bit color and 4:4:4 (no chroma subsampling) is available in uncompressed form.
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