Umm if we are talking about the Samsung 951 SSD.. then my two month old 2015 13" rMBP has the same SSD. This drive (along with ForchTouch trackpad) debuted in the 13" retina MBP's the first week of March. I'm not a spec-whore.. but I believe it is capable of up to 2.2GB/s.. or three times as fast as SATA-3. Its been real world tested to around 1.5GB/s with various file transfer programs.
5/19/15 at 1:04pm