There is no such thing as a thunderbolt PCI-E Add in Card. That interface comes from the motherboard and chipset. Asus fakes everyone out with a PCI-E card that DOES NOT WORK without a cable going from the motherboard to the "card" which is the thunderbolt interface. IT also only works with ASUS motherboards that have a (Thunderbolt header on the motherboard) The card is simply using the slot for power and a way to get the connector out the back. Asus also only has this for VIDEO not Audio.