1080gtx running slow with WPA

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At stock clocks you should be around 415 KH/s, with an overclock you should be around 530 KH/s. So yes, 290 KH/s is pretty low -- that's actually right in line with how a GTX 1070 performs. Assuming you're positive you have a GTX 1080 and not a 1070, check clocks, perf level, power limit, temps, make sure you're not being throttled.