DisplayPort21 has become a major talking point on the heels of AMD's RX 7900 XTX announcement, and for good reason.
DisplayPort 2.1 became a much bigger talking point than expected when AMD revealed its upcoming RX 7900 XTX and RX 7900 XT GPUs. It’s the latest standard from DisplayPort, a revision to the 2.0 spec released in 2019, and it’s a natural inclusion for next-gen GPUs. There’s just one problem — Nvidia’s behemoth RTX 4090 still uses DisplayPort 1.4a.
Like any new connection, it’s all about bandwidth. DisplayPort 1.4a, which you’ll find on all recent graphics cards short of the Intel Arc A770 and A750, as well as AMD’s upcoming RX 7900 XTX, tops out at 25.92 Gbps of maximum data rate. DisplayPort 2.1 goes up to 77.37Gbps . If you run some, admittedly complicated, math, you’ll find that the required data rate for 4K at 120Hz with HDR turned on is 32.27Gbps — higher than what DisplayPort 1.4a is capable of.
A 4K 360Hz monitor may sound insane now, but we have hardware capable of driving such a display. AMD is claiming 295 fps at 4K in Apex Legends and 355 fps in Overwatch 2. In addition, the RTX 4090 can push above 300 fps at 4K in Rainbow Six Siege, and the frame generation capabilities of DLSS 3 and the upcoming FSR 3 are sure to challenge the position of the 4K at 240Hz maximum we currently have on gaming monitors.
That display is a good touchstone, too. Assuming Samsung wants to keep with a 240Hz refresh rate like the current version has, you’re looking at a data rate above 45Gbps with HDR on , and that’s with 3:1 compression. This is all theoretical at the moment, we need to wait until we see this display and other 8K options, but the numbers suggest that the RTX 4090 may not be able to drive them due to its DisplayPort 1.4a connection .
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