Do I need a sound card even w/ the I3 CPU?

Do I need a sound card even w/ the I3 CPU?

I'm using this Win7 PC as a DVR to record and playback TV shows.

Now I'd like to listen to Pandra internet radio or just inhance the audio experience.

I. my HTPC has a HDMI cable connected to the AVR how is the sound card connected to the AVR ?

2.currently have only 5.1 speakers will a 7.1 sound card be compatable w/ 5.1?

3.will plugging in a sound card and updating driver be a easy process like plug and play ?

confussed w/ OEM modules w/out software.
the SC I link to will it require additionale software?

4.what features and specs. should a decent SC have?

5.Will the I3 CPU operate faster and cooler w/ a SC.?

6. Will audio from my recorded TV Window media center sound better?

I'm planning on obtaining a upgraded AVR from current the next step up AVR has internet radio builtin so I'm not sure if the AVR that I've picked
will meet my requirements.

7.I use a Harmony remote control looks like I'll have to add another activity named net radio configured w/ the SCs connections?

8.How do'es this SC look?
Thanks STB
http://www.newegg.com/Product/Product.aspx?Item=N82E16829102003

OK no sound card. Thanks STB



OK no sound card.

now I'm confussed about AVRs that have the feature of internet radio builtin compared to the AVR which is the next step down which is basicalley the same amp. minus the internet radio?

I'm thinking the AVR that has internet radio built in also has a small CPU (this amp is connected to a router) so if I'm using my own PC I really don't need a AVR w/ internet radio correct?

Thanks STB