It's not advisable to build a mining rig right now, GPUS are out of stock in every store in my country and that's not the worst part, I bought my gtx1660 ti for 400$ each and today it's 640$, the fact is people even still don't mind buying this cards at 640$ each, are they stupid? I don't know but getting back ROI should be their most worries, I think it's now nothing but FOMO
This is similar to 2017 again, however, it looks like NVidia is trying to curb people buying their board for mining,
https://www.news18.com/news/tech/too-many-cryptocurrency-miners-were-eyeing-this-graphics-card-and-nvidia-didnt-like-it-3451034.htmlI think it's the latest Nvidia GeForce RTX 3060, and just like we have seen in 2017, FOMO into GPU mining will make noobs lost a lot of money here. But who can stop this beginners into the mining activity, it's going to be a big risk for them.