Bassfisher was talking about checking your drivers for ability. You should only have one nVidia High Definition Audio controller in the Device Manager. I have a 680 GTX and that is all it shows. I do not really understand the HDMI/DP reference either. But there may be some differences between our installs. Are you seeing these just in the AIDA64 utility, or the Device Manager also?
If they show in the Device Manager, if you look at the properties for the nVidia controllers (or any other multiple controller entry), do they all look the same, or can you tell which one is active? If not, you might start uninstalling them to see what happens. Bassfisher was talking about enabling only one at a time to check, but I have not done that procedure.
Are you using a midi device?