Cryptocurrency mining needs very little bandwidth at all, but uses a LOT of processing power . I’ve run an entire farm on a connection that struggled to manage 200 KILObits/sec without issues from the limited bandwidth.
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When Bitcoin mining, you only need an internet connection for data syncing , which requires very little in terms of connection strength and bandwidth. There have been instances in which systems have mined Bitcoins successfully with as low as ~500 Kbps, which is nothing – dial-up speeds.
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