Optional Fan (for Water-Cooling or Passive-Cooling only) 
The optional fan is specifically designed to provide sufficient airflow over the CPU power modules and chipset area when water-cooling or passive-cooling is utilized, ensuring effective heat dissipation for the entire system. See page 2-14 for details.
Q-Fan 2 
ASUS Q-Fan2 technology intelligently adjusts both CPU fan and chassis fan speeds according to system loading to ensure quiet, cool and efficient operation. See page 4-34 for details.
ASUS Supreme Audio EntertainmentSupremeFX Audio 
SupremeFX audio card features Noise Filter and Echo Cancellation technology as well as the Superbeam Array Microphone, which picks up the sound you want and suppresses the noise when you need to communicate with your teammates during game play. This standalone audio card reaches the outstanding audio quality of 24bit/192kHz full sampling in all 7.1 surround channel, enabling you to enjoy high quality audio surround experience in hundreds of great games.
High Definition Audio 
Enjoy high-end sound quality on your PC! The onboard 8-channel HD audio (High Definition Audio, previously codenamed Azalia) CODEC enables high- quality 192KHz/24-bit audio output, jack-sensing feature, retasking functions and multi-streaming technology that simultaneously sends different audio streams to different destinations. You can now talk to your partners on the headphone while playing multi-channel network games. See page 2-24 for details.
ASUS Array Mic 
The bundled Superbeam Array Microphone receives only the sound coming from the reception cone and ignores the sounds coming from other directions. This mechanism eliminates a large number of interferences, including neighboring speakers and reverberations. It also uses advanced de-reverberation techniques to reduce echo and minimize its effect on the speech engine. This feature can enchance speech-centric applications like Skype™, online game, video conference, and recording.