Do I have more computing power in my office than the world did 40 years ago?

I've got an:
i7 Quad Core PC running at 2.8 Ghz

Intel Core Duo laptop running at 2.0 Ghz

Dual core 1.2 Ghz Kindle Fire HD

Dual 1.2 Ghz core LG smartphone.

Read more: Do I have more computing power in my office than the world did 40 years ago?