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Zetta is a unit prefix in the metric system denoting a factor of 10^21 or 1000000000000000000000.
The collective Bitcoin mining hardware is over 64 Exaflops in computing in October, 2013.
It is likely closing in on 100 exaflops now.
One of the leading makers of bitcoin mining rigs is pre-selling $12,995 20 nanometer ASICs. They will be over 5 times the speed of our first Jupiter release (28 nanometer asics) and over 30% more energy efficient.
The KNCminer Jupiter rig released in October performs 550 gigahashes per second.
The total compute was 1.9 petahashes per second in October and we are now at about 7 petahashes per second.
A petahash is converted to 10 about exaflops.
Bitcoin.sipa.be tracks bitcoin computing and other metrics.