According to a recent report from BenchLife, the upcoming GP104 GPU from NVIDIA will utilize GDDR5X memory instead of HBM2 as suggested by previous rumors.
The report claims that NVIDIA will officially announce the next-gen Pascal architecture in April, with the GeForce GTX 1080 launching sometime in May, right before Computex 2016. The GTX 1080 will feature the GP104 GPU and could ship with 8GB of GDDR5X memory. That means HBM2 memory has been reserved for the GP100 GPU that is expected to debut a few months after the GP104 cards are introduced.
The folks at BenchLife also report that the GeForce GTX 1080 will include a single HDMI port, a DVI port, and 2 DisplayPorts. They add that the card would include only one 8pin power connector, hinting at pretty high efficiency.
To us, the report does seem to make a lot of sense as both Samsung and SK Hynix recently announced that they will begin mass production of high-capacity HBM2 modules in Q3 2016.