i know where they are thanks for the help. But you can't use them unless you connect these ports to the motherboard right? Where would they get their power from otherwise?
I just read that the SPDIF connector on the board needs to be connected to the VGA card.
Unless these I/O ports are powered by the board itself and the other ones are just for VGA card if it has SPDIF on its slot.
The SPDIF doesn't need to be connected to the GPU, however IF you use an HDMI (video & audio) connector then you'd need to loop back an 'audio' connection to the Z-5500. So use an DVI -> Monitor and Optical MOBO -> Z-5500.
Otherwise is the 3mm connections, right, (1x3) and (1x3) as shown above; Front/Rear/Center. The quality of the speakers you'd never hear the difference.