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 1-36 for details.
1.3.2ASUS AI Lifestyle features 
ASUS Quiet Thermal Solution
ASUS Quiet Thermal solution makes system more stable and enhances the overclocking capability.
AI Gear 
AI Gear provides four modes that adjust the CPU frequency and Vcore voltage minimizing system noise and power consumption. You can choose the mode that best suits your computing needs. See pages 3-4 and 3-8 for details.
AI Nap
With AI Nap, the system can continue running at minimum power and noise when you are temporarily away. To wake the system and return to the OS environment, simply click the mouse or press a key. See pages 3-4 and 3-9 for details.
ASUS Advanced Q-Fan 
The ASUS advanced Q-Fan technology on P5B Series is powered by Intel Quiet System Technology; It makes the change of fan speed more smoothly. It’s better in fan use, and efficiently reduces the noise caused by fans’ abruptly speeding up. Moreover, Advanced Q-Fan has a better control over a constant temperature system environment. See page 2-30 for details.
ASUS Crystal Sound
This feature can enhance speech-centric applications like Skype, online game, video conference and recording.
Noise Filter
This feature detects repetitive and stationary noises (non-voice signals) like computer fans, air conditioners, and other background noises then eliminates it in the incoming audio stream while recording. See page 3-8 for details.
1- | Chapter 1: Product introduction |