Maybe the update gives more hashrate?
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Or maybe the update is just a ploy by some miners at Microsoft to lower the difficulty of their favorite coins by getting everyone else to turn off their rigs for an hour.
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Some gamers insist that every video device driver update improves their frame rates, but I haven't seen that translate very well to improved hash rates. But if anyone wants to update both their OS and their device drivers, now would be the time. Is .1709 a new Creator's Update?