From Videocardz:
"Today NVIDIA announced that GeForce RTX 3060 drivers will be able to detect if the user is mining cryptocurrency. This will automatically limit the performance by 50%, which will basically render mining on this card unprofitable. This is exactly what happened to the graphics card that was tested by CryptoLeo.

Just a minute or two after starting, the hash rate has dropped from 41.5 MH/s to 26-24 MH/s. Since the author of the video has no drivers for this card, this would suggest that the anti-mining algorithm is not present in the software, but rather implemented in the BIOS itself.

The RTX 3060 is the first graphics card that will feature this solution to detect mining. In the next few weeks, we should be seeing more news on the Crypto Mining Processor HX series that NVIDIA announced today."

https://videocardz.com/newz/zotac-geforce-rtx-3060-early-gpu-mining-test-shows-reduced-hashrate-in-action