Generally speaking, Macs don't have sound cards that can be upgraded. You can run an external sound card, such as a Lynx, in a Mac desktop. There is no way to put one into a Mac laptop or Mini, although I believe there are some external solutions.
I think it's erroneous to call the Bel Canto Link a sound card. It is a converter with added value.
I think it's erroneous to call the Bel Canto Link a sound card. It is a converter with added value.