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DisplayPort 2.1 GPU related to DisplayPort 2.1 monitor. Result? DisplayPort 2.1 join. Right? Apparently not, according to Monitors Unboxed. At least, not at all times.
DisplayPort, after all, optionally makes use of a type of picture compression referred to as Display Stream Compression or DSC. While it is meant to be visually lossless, there’s some debate over the attainable downsides of working a monitor with DSC enabled.
There have been studies, as an example, of black screen problems with Nvidia GPUs when enabling DSC and likewise the loss of DLDSR functionality. Anywho, Monitors Unboxed says that, until you might be utilizing the proper cable kind, it is “very unlikely” {that a} DP 2.1 show and GPU combo will truly run with DP 2.1 enabled.
Monitors Unboxed demonstrates this with a 32-inch 4K Asus QD-OLED monitor with DP 2.1 assist and an Nvidia RTX 5090 GPU. The full 10-bit color 4K 240 Hz sign required to drive the show at its native functionality makes use of 68.6 Gbps of bandwidth.
Sure enough, courtesy of the short DP80 cable (more on that cable in a moment, but the maximum length for a passive DP 2.1 cable is currently two metres, though many bundled cables are shorter) supplied with the Asus monitor, the channel confirms that DisplayPort 2.1 interface is running at the full UHBR20 rate. So, that’s 20 Gbps per channel, with four active channels for a total of 80 Gbps, enough to drive the Asus monitor without enabling DSC.
But what if you use another cable, perhaps a longer DP Cable that you already have? The monitor still works and still allows the full 4K 10-bit 240 Hz configuration. Everything seems normal at first.
But Monitors Unboxed found on closer inspection that the link speed had dropped to 10 Gbps per channel, and thus 40 Gbps total, forcing the use of DSC. This all happens automatically.
In some ways, this is desirable behaviour. Many users aren’t familiar with the intricacies of DisplayPort and DSC, so a system that works automatically and with full backwards compatibility is preferable to something that requires user intervention. Thus, a DP 2.1 monitor works seamlessly with a DP 1.4 GPU, for instance.
Many monitors also allow the user to choose whether DSC is available. In the scenario above, if DSC is disabled using the lower quality cable, the monitor deprecates down to a lower chroma subsampling of 4:2:2 and runs at a maximum of 144 Hz. So, that’s lower colour fidelity and lower refresh.
Depending on how hands-on with this stuff you are, you may or may not notice or care. But the bottom line is that if you want to get the full 80 Gbps of bandwidth from DisplayPort 2.1, it looks like it’s essential to use a DP 2.1-certified and tested cable, which is branded “DP80”, with the “80” signifying the 80 Gbps of bandwidth.
The DisplayPort.org website has a database of certified cables for anybody who needs to test that their cable is totally DP 2.1 succesful. For the document, AMD RDNA 3 (Radeon RX 7000) and RDNA 4 (RX 9000) are DP 2.1 succesful, as are Nvidia RTX 50 GPUs and Intel Arc B500 GPUs. So, now you understand. Over and out.
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