There was a rumour that that AMD and NVIDIA may use both HBM (and HBM2) as well as GDDR5, or GDDR5X on their next-gen GPUs in 2016, well AMD has confirmed this news.
Robert Hallock, the Technical Marketing Lead at AMD, explains: “We have the flexibility to use HBM or GDDR5 as costs require. Certain market segments are cost sensitive, GDDR5 can be used there. Higher-end market segments where more cost can be afforded, HBM is viable as well”.
That means the lower tier cards will come with GDDR5, or GDDR5X and just like previous cards, higher ones will feature both HBM and HBM2.