I have 2 RME Fireface 800, these have the Firewire 800 port. The H8000-FW has two Firewire ports and these are 400 type. If I am good to go with the Thunderbolt-Firewire cable then I might as well sell the RMEs and finance one more H8000-FW. I am asking because I am in the process of buying a 2014 iMac, these only have Thunderbolt and I am not interested in investing in another audio interface if the H8000-FW works with no problems.