Cryptocurency

As the title states, I have a deal (I don't know if it can be called one :) ) for 2 Asus GTX 1080 Strix at 800€ from an internet cafe. I will buy them so that I can start mining Cryptos. The thing is that they won't be giving me any kind of insurance if any of the cards go bad and the price I...

Hello all, this is my Z390 Godlike motherboard: https://www.newegg.com/p/N82E16813144209 Do you think I can fit 4 RTX 3090s or 4 RTX 3080s into the motherboard's PCI-E slots for mining? Do you need to connect the GPUs with SLI NVLINK connectors for mining? How do some people online fit 10-50...