Aqui te dejo la info de la web:

http://productsen.terratec.net/

Como ves en la 7.1 PCI si aparece (en picture) los logotipos de Dolby Digital Live y en la 5.1PCI no.


AUREON 7.1 PCI

Perfect surround sound!

Experience amazingly realistic sound at your computer with the Aureon 7.1 PCI! With up to eight audio channels you get a breathtaking sound experience that's like being at the movies: soundscapes nothing short of natural, charged with explosive effects!

With the Aureon 7.1 PCI, you can appreciate DVDs at an entirely new level of audio quality. Front and back, left and right, with you right in the middle. In computer games, surround sound provides extreme, realistic suspense. Hear exactly what angle your enemy is sneaking up on you from. Feel the explosions and effects - constant adrenaline rushes guaranteed!

Now you can finally hook up your PC directly Digital-supported amplifiers and digital speaker systems, because the Aureon 7.1 PCI encodes every audio signal - in real time - into a 5.1 Digital bitstream and sends it to your hi-fi system.

A single optical digital cable replaces what used to be up to 6 analog patch cables. This guarantees greatly improved signal quality with significantly less susceptibility to interference.

With numerous inputs and outputs, the Aureon 7.1 PCI is highly flexible and ready for just about every application, including VoIP apps. The card has 4 analog stereo outputs, one of which can be used to plug in headphones. In addition, there is an analog stereo input for any line level output device (such as a CD player), a microphone input as well as an optical digital input and output.

Convincingly true sound quality, a multitude of connection options and realistic Surround Sound beef up the Aureon 7.1 PCI - the ultimate sound machine for games, movies and music.

Lo que subrayo es lo que decía en el anterior post de que aun siendo 7.1 en realidad lo que saca es un 5.1 Digital al receptor AV.