Some times you would be right other times wrong.

Myself If i had 4 good cards rich now I think I would want 2 machines that could expand to 5 or 6 cards.

I wouldn't want 1 machine or 4 machines

but 2 is better than one in a choice point of 1 or 2.

Reason is if 1 dies you can trouble shoot really fast.

1 machine if it dies means very hard trouble shooting.