Which cable fits a 5120×1440 240Hz super ultrawide? Bandwidth breakdown

How this is calculated

DSC 3:1 compresses the signal to about 19.8 Gbps, which even DP 1.4 handles easily. That's how Samsung's Odyssey G9 OLED and similar super ultrawides hit 240 Hz over DP 1.4: they use DSC as the default, not the fallback. Dropping to 175 Hz (the non-compressed spec on most DP 1.4 super ultrawides) brings bandwidth down to about 43.4 Gbps, still too much for DP 1.4 raw but fine over HDMI 2.1 at 8-bit.

Verdict

5120x1440 at 240 Hz with 10-bit 4:4:4 HDR needs 59.5 Gbps, past DisplayPort 1.4's 25.9 Gbps and even past UHBR 13.5's 52.22 Gbps, so only UHBR 20 (77.37 Gbps) or HDMI 2.2 can carry the mode uncompressed. DSC 3:1 compresses the signal to about 19.8 Gbps which even DP 1.4 handles easily, which is how Samsung Odyssey G9 OLED and similar 49-inch super ultrawides hit 240 Hz over DP 1.4 by using DSC as the default rather than a fallback. The non-compressed alternative on DP 1.4 is dropping to 175 Hz (about 43.4 Gbps), still too much raw but workable over HDMI 2.1 at 8-bit. The practical answer splits in two: DSC for 240 Hz on any GPU, or DP 2.1 UHBR 20 (cables under 1 m) for uncompressed 240 Hz, with the cable-length constraint the price of native fidelity.