Hi, unfortunately, it does not support this card. I found this thunderbolt board is compatible with some precision series workstations and alienware models. Since the R610 was released, there is no thunderbolt support on this servers.    Hope that helps!
Is it possible to add a PCIe card with Thunderbolt 2 to a R610?  Dell has a card 7HMHP THUNDERBOLT that I am wondering if it could work. Thanks. Clay  
Thunderbolt in R610?