So I'm looking to add a 4k display to my 27 inch Late 2013. If it's possible. I also am wanting to make sure it's 60GHz. On Apple's website, this is what it says. What the heck is a SST? Been searching on the internet and must be dumb, because I'm not following. Single-Stream (SST) displays Most single-stream 4K displays are supported at 30Hz operation. With OS X Yosemite v10.10.3 and later, most single-stream 4K (3840x2160) displays are supported at 60Hz operation on the following Mac computers: MacBook Pro (Retina, 13-inch, Early 2015) and later MacBook Pro (Retina, 15-inch, Mid 2014) and later Mac Pro (Late 2013) iMac (27-inch, Late 2013) and later MacBook Air (Early 2015) Any help would be appreciated, especially if you have this setup?