Its just the default fan profile!! You can change it to whatever you want, you can make it 100% silent if you want to optimise for low noise. Maybe Asus have optimised for cooling performance. Wizzards load test shows the card running 67 degrees. Even with overclocking, it stays about the same at 68 degrees so there is plenty of head room to adjust the fan speed down before you hit the 80 degree throttling point.