All, I have an old 2011 iMac 27" 3.4ghz i7 with 32gb of RAM connected to a Drobo 5D via Thunderbolt 1. The drives inside the Drobo 5D are Western Digital 4TB Purple 3.5" Hard Drives (WD40PURX). I can't even play a 4k video file that's located on the Drobo 5D (it freezes and is very choppy). My 2011 iMac even struggles with simply playing a 4K file located on the desktop. If I were to buy a 2017 iMac i7 and upgrade the Drobo to the 5D3 version that has a TB3 connection, can someone tell me if I would be able to edit the 4K video files located on the Drobo 5D3? Or, would it have to be on the iMac SSD to edit the 4K video file? If someone could try to put in laymen's terms about how much faster my data transfer would be with the iMac/Drobo upgrade I would appreciate it. I know the new setup would be faster, but I always thought the transfer speed was limited by the 7200rpm hard drives in the Drobo? Please explain to a newbie... And, if there is any other solution out there like a drobo that's a better solution please provide information. I currently have 10TB of data and growing. It would have to be a user friendly setup because computers are not my forte. Thanks for your help.