...Then theres HBM2. Id have argued for its inclusion in GeForce Pascals a few months ago, but GDDR5X is on the way. This memory doubles the prefetch length and also should come with a fairly large increase in effective clock speed. Itll be cheaper to use than HBM2 at similar aggregate bandwidths, and its cheaper to implement at the on-chip PHY levelnot to mention the savings from the lack of an interposer and stack packaging. GDDR5X also doesn't have strict rules tying bandwidth to capacity. That lets Nvidia use memory sizes other than 4GB, 8GB, 12GB, or 16GB on its GeForce products, compared to the limitations of HBM2.
Given those guesses, I think theres at least one consumer chip that's still really big, but quite a bit smaller than 610 mm². It probably has similar overall throughput to GP100 in the metrics we care about for graphics, and it'll probably come with less memory capacity. Even so, it should still have plenty of overall bandwidth. Some rumours say this chip is called GP102. I think it'll have 56 to 60 SMs, 1/32nd FP64 throughput, and more than 8GB of 384-bit GDDR5X. If it exists, then its likely destined for a Titan-class card first, and maybe a enthusiasts favourite Ti product later on.
Nvidia is also likely working on a GM200 replacement for the pair of high-end GeForce non-Tis that make up the meat of the enthusiast market these days. Its likely called GP104. That chip will likely also have token FP64 throughputremember that these are GPUs, not HPC cards. I also bet it'll have 8GB of 256-bit GDDR5X, 40 SMs or thereabouts, and all the associated machinery in terms of texturing and backend throughput that implies, in a die of around 300 mm².