With the incredible die size of Volta, and the cost associated with it, I wonder if the rumors are true that AMDs next gen GPU codenamed Navi is using the same strategy as their Zen CPUs (Ryzen, Threadripper, Epyc) - multiple smaller dies connected for better yields and lower cost.

Would something like that be even possible with GPUs? I know the Exascale paper from AMD mentions GPU chiplets which sound like this.