Bandwidth:
- DisplayPort 1.4: 32.4 Gbps
- DisplayPort 2.1: 80 Gbps
DisplayPort 2.1 offers nearly triple the bandwidth of DisplayPort 1.4, making it capable of supporting significantly higher resolutions and refresh rates.
Encoding:
- DisplayPort 1.4: 8b/10b encoding
- DisplayPort 2.1: 128b/132b encoding
The encoding scheme used by DisplayPort 2.1 is more efficient, allowing it to achieve higher data transfer rates with less overhead.
Concurrent LT for Multiple Repeaters:
- DisplayPort 1.4: Trains repeaters one at a time
- DisplayPort 2.1: Trains repeaters concurrently
This feature in DisplayPort 2.1 significantly reduces the time it takes to train multiple repeaters, which can be beneficial for long cable runs. See
DisplayPort 128b132b Concurrent LTTPR Link Training for more details.
Forward Error Correction (FEC):
- DisplayPort 1.4: Optional
- DisplayPort 2.1: Mandatory
FEC helps to ensure the integrity of data transmission by correcting errors that may occur during the transmission process.
Panel Replay (PR):
- DisplayPort 1.4: Not supported
- DisplayPort 2.1: Supported
Panel Replay allows the display to store and replay static images, reducing power consumption.
Single Stream Transport (SST) and Multi-Stream Transport (MST):
- DisplayPort 1.4: SST is mandatory, MST is optional
- DisplayPort 2.1: MST is the default; SST is optional through falling back to DisplayPort 1.4 link rates
Multi-Stream Transport (MST) allows a single DisplayPort device, i.e., GPU, to drive multiple displays.
Aux-Less Advanced Link Power Management (ALPM):
- DisplayPort 1.4: Not supported
- DisplayPort 2.1: Supported
ALPM helps to reduce power consumption by allowing the DisplayPort link to be powered down during periods of inactivity.
Benefits of DisplayPort 2.1:
- Supports higher resolutions and refresh rates
- More efficient: 128b/132b encoding scheme more efficient vs 8b/10b encoding
- Better reliability: Forward Error Correction ensures data integrity
- Reduced power consumption: Panel Replay and ALPM features
Whether or not it suits your use-case is up for debate, but I'm waiting on the DP 2.1 Gigabyte model to see what I can get up to with Custom Resolution Utility + MonInfo and perhaps be able to go 241-480hz+ or more on the panel at 2560x1440 or 1920x1080 (breaking my warranty of course in the process, if anything goes wrong)
as well as potentially 8k at 120hz or higher i