AMD’s Northern Islands family is composed of four GPUs, roughly divided into two categories. At the top is the 6900 series powered by Cayman, AMD’s first VLIW4 GPU. Below Cayman are three more GPUs, all derived from the VLIW5 Evergreen generation(5000 series). The first of these GPUs was Barts, which is the basis of the 6800 series that launched back in October of 2010. However up until now we haven’t seen the other two mystery GPUs in the retail market. Today that starts to change.