Can you still build mining rigs with 6gb GPUs like gtx 1660s in 2022? For how long can this graphic cards keep up with mining? I'm sure they are better option over rx580 4gb, what do you think?
https://minerstat.com/dag-size-calculator?lang=enYou can mine ETH until august 2024.
But you can mine Flux for ever for example, 6GB are more future proof, but it depends on how long you plan to mine, what coin you wish to mine and what the crypto market do in the future.
I prefer cards with 8GB or more.