IgorsLAB published The possible reason for crashes and instabilities of the NVIDIA GeForce RTX 3080 and RTX 3090 A quote from the article:

Not only the editors and testers were surprised by sudden instabilities of the new GeForce RTX 3080 and RTX 3090, but also the first customers who were able to get board partner cards from the first wave. An interesting pattern of behavior emerged that did not affect all cards or manufacturers and the problems only occurred at certain boost clock rates above or just around 2 GHz. To make matters worse, NVIDIA has obviously also slightly undermined the quality management of the board partners (AIC) due to the secrecy – unconsciously, of course, but with plausible consequences. A chain of adverse circumstances? This could well be the case, because this explains the somewhat diffuse error pattern from the most diverse forums.

  The possible reason for crashes and instabilities of the NVIDIA GeForce RTX 3080 and RTX 3090