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As expected, Nvidia’s high-end graphics processor that belongs to the “Pascal” family will feature an all-new architecture....
...next-generation high-end graphics cards with “Pascal” GPUs will sport up to 16GB of HBM2 with up to 1TB/s bandwidth. Previously Nvidia expected select solutions with “Pascal” graphics processors to feature up to 32GB of HBM2.
According to the list... there's been no news since October? So I guess that recent AMD demo of small Polaris vs a GTX950 was just a fake then? Or perhaps there's no solid article to be linked, if so then fair enough.