I have a 7910 tower with Thunderbolt 2 AIC. The newer 7720  has the Thunderbolt 3 AIC which I need. (Have external Akitio Thunder 3 storage for 7710 Laptop) so I can use it on both systems. Ive called and emailed about purchasing this card from Dell and no one can get me the card as they wont sell it separately! Shame on you Dell!