The brain works by activating connections (synapses) between neurons. A human brain can activate about 1016 (that's 10 quadrillion) connections a second. If we compare a synapse with a floating-point instruction, we could say that your brain's performance is at about 10 petaflops. For comparison, today's fastest computer, the IBM Roadrunner, can reach a measly 1.7 petaflops in a good day (it also occupies 560 m2 and draws almost 4 MW - not even a strict diet of Big Macs could possibly top that).
What are you doing with that hardware?