Htpc graphics choice

[86gtv]

Just wondering do you need a 780 or similar for a htpc if you are connecting to a AVR?
What advantages come with a top spec card if I was only using it for streaming/browsing?

 

[86gtv]

So it will make no difference to picture quality when streaming 1080p to led tv? Also will the AVR upscale content coming from pc?

 

[86gtv]

Thanks lads great help as usual