GeForce 30 series

The GeForce 30 series is a family of graphics processing units developed by Nvidia, succeeding the GeForce 20 series. The series was announced on September 1, 2020, and started shipping on September 17, 2020. The cards are based on the Ampere architecture and feature hardware-accelerated raytracing (RTX) with Nvidia's second-generation RT cores and third-generation Tensor Cores. 
Release and availability issues.
The lack of pre-order functionality and high demand exacerbated by the ongoing COVID-19 pandemic, and boost in popularity of cryptomining resulted in a large number of online retailers struggling with the sheer number of purchases on launch day for the RTX 3080, September 17. Newegg had completely sold out as expected on Black Friday. Long lines formed outside physical stores with stock, such as Micro Center in the United States, and in Japan. Twitter users reported that they used bots to buy large numbers of cards to resell for higher prices.
Nvidia released a statement the following day, apologizing for the difficulties with their online store, which went down on launch day due to high traffic.
On October 2, 2020 Nvidia announced that it would delay the release of RTX 3070 cards by two weeks to guarantee availability. On October 5, 2020 Nvidia's CEO, Jensen Huang announced delays due to supply shortages, which were expected to go on until 2021.
On October 9, the company announced that all Founder's Edition graphic cards in the United States would temporarily be sold via Best Buy, while the official web store would be upgraded to improve the shopping experience.
In early December 2020, Nvidia blamed continued component shortages on Samsung wafer shortages, resulting to chip shortages, among other factors.
Shortages of RTX 30-series cards continue into 2021. In March 2021, TechRadar reported that the shortages could continue until Q3 of 2021, in part blaming a global GDDR6 memory shortage and the cards' supply being bought out by cryptominers. In an effort to limit purchases by cryptominers, in February 2021, Nvidia announced that the RTX 3060 cards would be able to detect algorithms for mining of the Ethereum cryptocurrency and halve the hash rate. Shortly after release, NVIDIA accidentally released a driver update which disabled the detection. In April 2021, Hong Kong Customs and Excise seized 300 non-video CMP cards.
Nvidia officially announced new RTX 3080, RTX 3070, RTX 3060 Ti LHR SKUs on May 18, 2021.
Details.
Architectural improvements of the Ampere architecture include the following: