Does DisplayPort 1.4 support 1440p 144Hz? Bandwidth and HDR guide

How this is calculated

This is the canonical 27-inch 1440p gaming monitor mode. Any DisplayPort 1.4 cable with a certified DP-HBR3 chipset handles it without DSC, which means latency and color accuracy are both at their best-case values. Older DisplayPort 1.2 tops out at 17.28 Gbps and can't quite make this at 4:4:4. You'd have to drop to 8-bit (13.4 Gbps) or use 4:2:2 chroma.

Verdict

1440p at 144 Hz with 10-bit 4:4:4 HDR needs 17.8 Gbps, about 69% of DisplayPort 1.4's effective 25.9 Gbps rate, which leaves headroom for signal overhead, adaptive sync metadata, and audio return without DSC. That's what makes this the canonical 27-inch 1440p gaming monitor mode on DP 1.4: latency and color accuracy sit at best-case values because the link is uncompressed. Older DisplayPort 1.2 tops out at 17.28 Gbps and can't carry this mode at 4:4:4, which would force an 8-bit drop to 13.4 Gbps or a 4:2:2 chroma fallback. Push past 144 Hz to 175 or 180 Hz (common ultrawide overclocks) and you cross the DP 1.4 ceiling, which is where DSC or HDMI 2.1 take over.