Stemz :
So I've been tying to connect my pc to my home theatre since its a 7.1 surround sound system but i could only seem to get it to run stereo 2.0 i probably don't have the required equipment my mother board has 5.0 audio. My gpu is a nvidia 760, the card had true audio but i have no clue what that is lol I'm kind of new to this would i need a audio card to run 7.1?
If your amplifier supports HDMI, use that and read no further.
If your amplifier does not support HDMI, your options are limited to what can be accomplished with optical audio using the S/PDIF protocol.
As far as audio is concerned, HDMI supports the following:
Up to 8 channels of LPCM (uncompressed digital audio) at a data rate of 24 bits per sample and 192,000 samples per second (24bps/192Khz).
All major consumer implementations of compressed Dolby Digital bitstreams, Dolby Digital Plus bitstreams, and lossless Dolby TrueHD bitstreams
All major consumer implementations of compressed DTS bitstreams and lossless DTS-HD Master Audio bitstreams
S/PDIF on the other hand supports only the following:
Up to 2 channels of LPCM (Mono/Stereo only) at a data rate of up to 20 bits (many are limited to 16) and is usually limited to 48Khz.
All major consumer implentations of Dolby Digital bitstreams
All major consumer implementations of DTS bitstreams
S/PDIF does not support more than two channels of LPCM, high LPCM resolutions or bitrates, or high-bandwidth/lossless compression codecs such as Dolby Digital Plus, Dolby TrueHD, or DTS-HD Master Audio.
If your receiver is connected via optical right now (S/PDIF device in Windows Audio) you will not be able to configure it as more than a stereo receiver. It can't be done. You can configure it to receive Dolby Digital / DTS bitstreams if the application targets that device and is allowed exclusive control. This requires an audio source that is compressed to the appropriate format, such as a DVD.
Most PC games will not generate compressed bitstreams like they do on last gen consoles (excepting some cutscenes which are entirely prerecorded) so it's not possible to obtain 5.1/7.1 output from PC games over optical.
The only work around for this is to use a sound card that has hardware support for compressing audio into a Dolby Digital or DTS bitstream in real time. Creative Labs offers sound cards that do this with technologies named Dolby Digital Live and DTS Connect. Some motherboards support this as well. In general though, the audio quality from these technologies is less than stellar.
Solution: see above, use HDMI if you have it.