Let's say that we have one processor with a 64-bit in our computer, that will make the CPU much faster than a dual processor with 32-bit.
I am not quite sure if we use the dual processor with 64-bit that would make 2 times faster than the one processor with 64-bit. I am not sure if it is a tricky for us to think of this design.
I was at MacWorld Expo in Boston a couple of years ago. There was a company that used to sell a computer with 6 processors in it. I think the company was Umax. The price was awful, and probably, the company went bankrupt.