The messy DisplayPort 2.1 specs mean you could be limited to a monitor cable too short to be of any use if you want to hit 4K at 240 Hz

pcgamer.com:

DisplayPort is generally seen as the superior technology for transmitting images from a graphics card to a monitor, but the latest 2.1 version is causing all kinds of headaches. Poor quality or very short cables limit how useful the tech actually is, but the confusing specs don't help either.

The DisplayPort 2.1 specification was released in October 2022 and mostly consisted of the cable certifications required to fully support the UHBR10, UHBR13, and UHBR20 signalling modes—10, 13, and 20 Gbps respectively. The last one is the most significant as a four-link DisplayPort 2.1 setup, using UHBR20 signalling, can transmit a 4K frame at 240 Hz, without needing to use DSC (Display Stream Compression).

However, as reported by Monitor Unboxed (via Tom's Hardware), even if you have a graphics card and monitor that are DisplayPort 2.1 compliant, the cable between will have a far bigger say on whether or not you'll get the maximum transmission rate. VESA, the organization behind DisplayPort, will certify a cable that supports UHBR20 signalling as being DP80-compliant, where DP80 is the certification that confirms your cable can cope with the full 80 Gbps stream.

That's all well and good, but those on the market that genuinely are DP80, are barely more than one metre in length. That's fine if your monitor is right next to your gaming PC, but what if the latter is on the floor? I have all my PCs and screens on one large desk but prefer to use two metre cables, as I use monitor arms so that I can swing them out of the way when they're not being used. One metre cables just wouldn't work.

Such short lengths aren't down to VESA being picky, as the DisplayPort specification doesn't actually state length requirements, other than all DP cables under 2 metres in length must be able to support HBR2 signalling as a minimum. However, VESA's database of DP80-certified cables is full of entries all 1.2 metres or shorter.

In other words, vendors don't seem to be willing or capable of making