Clearly the GPUs are not being used for video. GPUs are being used because they are better at certain math processes than a CPU. In the case of cryptocurrency mining, GPUs are on the order of 80x faster than a CPU when is comes to solving the transaction blocks. For bitcoin mining, an ASIC miner is better. But other cryptocurrencies (like Ethereum) are processed more quickly using GPUs. So depending on the algorithm, a GPU can be much better suited to the task than a CPU.
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