The card comes in quiet mode from reading around so flip the bios switch then reboot for uber mode.
its just a bios switch with a different fan profile you can adjust the fan profile in catalyst overdrive. the whole uber/silent mode confuses me. especially now since the switch just switches between an asus and sapphire bios for me. i think the way it works is if you never unlock overdrive from catalyst cc then it will default to 40% fan on one side(silent) and 55% on the other side(uber). but if you unlock overdrive then you can adjust fan and target temperature. so switching is not really needed anymore. thats just my experience there could be more to it.
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