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My Sapphire does it the same when POST it max out the RPM at 50% for 1-2 seconds. It's not the power issue, it's just when you boot. It runs at full power because the GPU itself controller haven't boot up itself yet too to control the fan and temperature reading.
It's a safe protocol to keep the card from heat surge at boot. My card is fine + overclocking on my HX750.
Try on a 1000watts. it's the same outcome.
It's a safe protocol to keep the card from heat surge at boot. My card is fine + overclocking on my HX750.
Try on a 1000watts. it's the same outcome.