Chinese website BenchLife, VideoCardz reports that the card will either be called the GTX 1080 or GTX 1800 and that it will take advantage of a Pascal GP104 GPU core featuring 8GB of GDDR5X. What is missing is HBM2, or second-generation high-bandwidth memory. That is not to say it will not have it, just that the source didnt have the details.
The rumour says that Pascal will launch in April and GTX 1080/1800 launch in May 27. The GTX 1080/1800 has a GP104 Pascal GPU and GTX 1080/1800 has 8GB GDDR5X memory. The GTX 1080/1800 has one 8pin power connector and the GTX 1080/1800 has 1x DVI, 1x HDMI, 2x DisplayPort. First Pascal board with HBM would be GP100 (Big Pascal)
It would appear that the GTX 1080 would feature an 8-pin power connector, meaning it will max out at 225W. Nvidia’s GTX 980 card has a 165W limit, while theGTX 980 Ti maxes out at 250W.
Of course this is just rumour and speculation, but the Chinese sources have been right before so they are worth a mention.