Sir Abacus
Member
NV's roadmap highlight new tech, it doesn't state anything about the end products. 3D memory is a technology that may or may not be used in a product based on Pascal architecture. Pascal generation will have lots of chips in it and I'm pretty sure that most of them will end up with LPDDR3/GDDR5 and not HBM2. There is a reason why Fiji is the only GPU with HBM in AMD's 300 series. Same reason will apply to Pascal and HBM2 as well I think.
Oh no doubt. I'm 90% sure we'll only see it with Big Pascal.
When you're thinking about bandwidth usage per frame you have to remember that for the next 3-5 years we'll be limited by that DDR3 pool of Xbox One here.
We're already well past that. 68.3 GB/sec? GTA V sits on 160GB/sec or so on my 980 Ti at 1440p maxed out.