Communications Network Riser & Audio Modem Riser.
ive never really paid much attention to these before but,
What the heck are these for?

Nothing...LOL. Not much of anything was ever put out for them. :rolleyes:

they're suppose to be a special slot for modems and sound cards. But i haven't seen any modem nor sound card that actually uses cnr or amr. to my opinion, they're just taking up space on your motherboard.