The PCI version Asus Xonar Essence ST PCI 7.1 Sound Card is the world’s first audio card to focus on precision clock tuning to minimize audio jitter. The result is extensive musical details and lively sound image presented for revolutionary listening experience. It also comes with 7.1 channel output upgrade possibility with Xonar H6 multi-channel extension board sold separately in the future. Equipped with carefully-selected components, ASUS’ exclusive Hyper-grounding and EMI Shield design, the Asus Xonar Essence ST PCI 7.1 Sound Card is capable of achieving an industry-leading 124dB SNR (Signal-to-Noise Ratio) in signal clarity and full-driving any available headphone with built-in headphone amplifier—presenting unprecedented audio to sate even the most demanding audiophile. So be sure to pick up the Asus Xonar Essence ST PCI 7.1 Sound Card today!