Does anyone know when exactly ETH becomes PoS ?
And when it's happens what coin is good to replace in our mining rigs (especially with AMD Polaris GPUS) ?
No one really knows as the devs of Ethereum are well known in missing the deadlines they pone to do.Based on that I would say as a minimum can happen in late 2022 early 2023 so there is enough time to keep mining Ethereum and making money like all miners do.
Plenty of other coins to mine if Eth goes PoS and the top of them are,ERG,ETC and RVN.