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Not that coin :) (Etherum is on GPUs but bitcoin on ASICs mostly)

Ethereum hashrate dropped by 20% in last month, too.

so what happens to the unused ASICs?

Being shipped elsewhere. At least two Chinese miners have shipped a bunch to Kazakhstan.

Landfill

Trash or being sold to other miners. Most likely trash, though.

Not just graphic cards. I had to wait 3 month to source an AMD CPU. Aren’t they manufactured in the same fabs than GPUs? And still waiting for the ps5 to go back in stock!

The real change will happen when Ethereum moves to PoS and overnight turns off PoW mining. It is estimated to happen by end of this year or Q1 2022.

It was estimated to happen in Q1 2019, too. It looks more promising this time but I wouldn’t put much faith in Ethereum timelines.

Q1 2019, there was no Beacon chain running. They're pretty much live already but only running the skeleton chain to make sure such a sensitive system is given time to test and work out the kinks.

Given that the beacon chain has been running since December 2020 and people have locked in billions of $ worth of ETH, highly unlikely the switch will get delayed by long time now.