Question Were the GTX 20xx card DisplayPort 1.4 compliant?

[BarkingGhostar]

Trying to determine which version of DisplayPort that last generation NVIDIA cards were adhering to so I can their HBR capability and in turn the resolution x refresh rates. HBR3 as defined on the wiki page for DP says DP1.4 supports 3840x2160 at 120 Hz. I was wondering if the NVIDIA 20xx boards were compliant in terms of DP standards, or just capable--I presumed they were capable.