Issues with 4K at 120Hz and 4:4:4 color on your TV and PC
Issues with 4K at 120Hz and 4:4:4 color on your TV and PC
DisplayPort struggles with 4K at 120Hz in full 4:4:4 quality. It falls short of the required bandwidth. HDMI 2.0b also faces similar issues, offering less data than DP 1.4. It supports 4K at 60Hz in 4:2:2 resolution. For more details, see the BenQ knowledge base and Wikipedia entries on HDMI versions. The main bottleneck lies with the GTX 1080 and its ports. Display Stream Compression (DSC) is a potential fix, though I’m unsure if the GTX 1080 can use it. DSC works on RTX 2000 models, which came after the HDMI 2.1 support for RTX 3000 series. Recent updates have pushed HDMI 2.1 to 4K 120Hz HDR, but DisplayPort remains limited at 1.4.
It seems I got it wrong when I was checking the DP wiki—it matches exactly what you said on the site. Maybe I should look for an affordable upgrade for my 1080 with a 2.1 port. Luckily, it won’t break anything important, and I can handle it until I upgrade my GPU.