AMD's Polaris To Feature HBM2 And GDDR5 Memory Technologies
 

While only a GDDR5 configuration of the Polaris architecture has been publically demonstrated so far, AMD staff has confirmed that it will also support High Bandwidth Memory technology. HBM is a revolutionary stacked memory technology that the Sunnyvale California based company invented in collaboration with SK Hynix and introduced to the market last year with the Radeon R9 Fury graphics card series. Due to its very high bandwidth, very low power capability and small footprint; it enabled the creation of very high performance graphics products in a variety of form factors culminated in the R9 Fury X, R9 Fury and R9 Nano graphics cards.

http://www.hardocp.com/news/2016/01/...echnolo gies/