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Help a new miner plz

Hi! I have an Asus Radeon Rx580 8gb and I turned on the Resizable bar in the bios and now my hashrate is 0MH/s. Even my gpu temperature is just 33°C. At one moment I reached 41MH/s but then it got back to 0.
My configuration is this: Motherboard: Asus prime h410m k
16gb of Ram
Intel I5 10400
My question is how can I mine with the Resizable bar on?

ps. I am mining ethereum
ok so actually i just restarted the pc and now its mining at 32-33 HM/s but I still dont know how it was 41 for a second

Resizable bar won’t change anything for mining on an rx580

tank you very much