Recently rumors popped up that the flagship model might come with 8GB of High Bandwidth Memory (HBM), whereas previously it was believed that 4GB was the maximum possible. FUD Zilla has an alternative explanation today as the site came across circumstantial evidence that AMD's Fiji may actually be a dual-GPU card and that this is how the card ended up with 8GB of first-gen HBM memory.
So, when Fudzilla wrote that Fiji is going to ship with 8GB of RAM, we didn’t actually think that we were talking about two separate GPUs, on separate interposers, with each GPU using 4GB of HBM1 memory. This is how AMD got to 8GB, or should we say two times 4GB for this card. It makes much more sense now, and of course we would not be surprised to see Fiji for notebooks and lower-end desktop products in a single GPU configuration.
AMD is betting big on Virtual Reality (VR), and we have been aware of this since late 2014. The company knows that Nvidia is putting a lot of effort into VR research and development, so AMD wants to try to beat Nvidia in this new emerging market.