Does my motherboard support dolby 7.1

Solution
Sound Core3D has been certified for Dolby Digital decode.

Dolby Digital Live works inside your PC or game console while you play, encoding the 5.1-channel audio in the game's audio engine into a Dolby Digital output bitstream. This makes the audio compatible with all Dolby Digital 5.1 playback systems, including A/V receivers, home-theater-in-a-box (HTiB) systems, and integrated 5.1 speaker systems. It also makes connecting your PC or game console to your home theater easy. All you need is a single S/PDIF connector.

7.1 adds two additional speakers to the more conventional six-channel (5.1) audio configuration.
Sound Core3D has been certified for Dolby Digital decode.

Dolby Digital Live works inside your PC or game console while you play, encoding the 5.1-channel audio in the game's audio engine into a Dolby Digital output bitstream. This makes the audio compatible with all Dolby Digital 5.1 playback systems, including A/V receivers, home-theater-in-a-box (HTiB) systems, and integrated 5.1 speaker systems. It also makes connecting your PC or game console to your home theater easy. All you need is a single S/PDIF connector.

7.1 adds two additional speakers to the more conventional six-channel (5.1) audio configuration.
 
Solution
Above seems mostly correct, but why do you ask?

*I can't find any reference to 7.1 though, only 5.1 (as in two front, two rear, center and subwoofer but not SIDE speaker support).

Here's more that the above is copied from: https://www.dolby.com/us/en/technologies/dolby-digital-live.html

Unless you are gaming and using a Home Theater setup with the SPDIF (TOSLINK) digital signal from the PC I'm not sure it matters.