So i hook up with 2 of my buddy into the crypto world.

We are interested to build a rig right now.

Mainly we want to mine BTC (or maybe ETH)

Here is our noob questions:

1.We may get 3-5 graphic cards. If the total price is about the same, which should we choose GTX1060, AMD RX 570 or 580?

2. Does the graphic memory important to mining process?

3.I know the website https://whattomine.com/ , but I don’t know how to calculate the profit if i use 570/580 to mine ETH and use all the card above to mine BTC. How to find out the rate?

Thanks!