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Retrieved 26 November An " arms race " has been observed through the various hashing technologies that have been used to mine bitcoins: basic central processing units CPUs , high-end graphics processing units GPUs , field-programmable gate arrays FPGAs and application-specific integrated circuits ASICs all have been used, each reducing the profitability of the less-specialized technology. Bitcoin mining is also expensive, so fees help to offset the cost of equipment and electricity used.
