Ethereum's transition to the Proof-of-Stake model has collapsed not only ETH mining, but all alternative cryptocurrencies as well. Due to the high complexity of mining new blocks, the profitability of mining continues to fall.
Here's What We Know
On September 16, Tom's Hardware website published a table showing the profitability and payback of mining depending on the model of video cards at a cost of $0.1 per 1 kWh of electricity. For example, with a GeForce RTX 3090 Ti costing $1163 it makes $0.31 loss and never pays off.
But it is possible to recoup the cost of the GeForce RTX 3090 ($897). Although you will have to spend more than 61 years (22,433 days) to do so. Payback period of video cards Radeon RX 6800 XT and Radeon RX 6800 is about 9000 days, that is more than 20 years. The sad leader was the Radeon RX 6600 XT card - 25,504 days.
However, these figures were actual on September 16, 2022. In a few days the yield dropped even more. Now no NVIDIA or AMD graphics accelerator can recoup its cost by mining alternative cryptocurrency.
Source: Tom's Hardware