GeForce RTX 3080 cards are finally getting into the hands of consumers, but some units are proving unstable at factory overclock speeds. 2.0-2.1 GHz seems to be the threshold for causing issues, with many cards crashing to desktop when they reach these frequencies.
https://www.notebookcheck.net/Some-NVIDIA-GeForce-RTX-3080-cards-are-crashing-at-factory-overclock-speeds.495200.0.html