A cryptocurrency miner has confirmed that Nvidia's hash rate limiter works as intended on the GeForce RTX 3080 Ti. Hash rates for Altcoins such as Ethereum Classic, Ergo, and RavenCoin appear to be significantly lower, too.
https://www.notebookcheck.net/The-Nvidia-GeForce-RTX-3080-Ti-s-hash-rate-limiter-also-targets-other-mining-algorithms.543111.0.html