There's been reports of stability issues, with this site suggesting a possible cause. 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. EVGA have offered some info here.