Wait, you are using those clocks for mining?
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No, that's wrong if its the case, if you mine ETH, set the clock to 1200mhz Core Min, 1300 Core Max, Voltage 881 or the lowest you can set, and memory to a max of 2100 or 10-20mhz lower if its unstable. That gives you around 61-62 Mhs at 150w. I let my 6800XT mine ETH whenever I can, it stays at 61.5 Mhs all the time without a hitch.
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The fan auto ramp could be because it gets quite hot, using the settings above would help a lot with temps while mining.