Got the sound working with the Elgato HD 60 pro in a 2 pc setup. I had to install the Nvidia HD Audio drivers. Seems like the Microsoft HD Audio drivers couldnt cut it. Thanks to this post on REDIT

https://www.reddit.com/r/ElgatoGaming/comments/3ydh4i/elgato_hd60_pro_not_showing_up_in_playback/