So, I know it's possible to use a 4k display as a second display with the new 5k iMac, and you can get 3840 x 2160 @60hz using DisplayPort 1.2 with MST. My question, is, does that display use bandwidth on the sole Thunderbolt 2 bus? I plan on running the OWC ThunderBay 4 with two 6g SSDs in RAID 0 as my boot drive (along with some other drives) via TB2, and I'm worried that with a 4k display on the same bus as the RAIDed SSDs that there will be bandwidth issues that will slow things down. I've googled a bunch and couldn't find the answer, does a display use the Thunderbolt bus? Or does DisplayPort just connect directly to the GPU? Also, two 6g SSDs RAID 0'd via TB2 will be faster (or as fast) for all tasks than the internal SSD that comes in an iMac, right? I plan on getting the 3gb Fusion drive and using it to handle all of my documents and mediausing a Fusion drive for those files and a pure RAID 0 dual SSD set-up for my boot drive best fits how I use my machine for work. I'm coming from a 6 core Mac Pro, so I haven't had to ask these questions before. Thanks in advance for any help y'all are able to provide.