I'm somewhat dismayed that the GTX 1080 has only 8GB of VRAM considering that previous generation AMD products already had 8GB, and the previous generation Titan model had 12GB—the latter of course being outperformed by the GTX 1080.
Then again, rendering a demanding title at 8192x4320 on a single card and downsampling to 4k is probably wishful thinking anyways. However, it's definitely a legitimate concern for those with dual/triple/quad GPU setups rendering with non-pooled VRAM.
On the bright side, 8GB should hopefully be sufficient to pull off 8k/4k supersampling[0] with less demanding titles (e.g. Cities: Skylines). Lackluster driver or title support for such stratospheric resolutions may prove to be an issue, though.
It's possible Nvidia is saving the 12GB configuration for a 1080 Ti model down the road. If they release a new Titan model, I'm guessing it'll probably weigh in at 16GB. Perhaps less if those cards end up using HBM2 instead of GDDR5X.
Then again, rendering a demanding title at 8192x4320 on a single card and downsampling to 4k is probably wishful thinking anyways. However, it's definitely a legitimate concern for those with dual/triple/quad GPU setups rendering with non-pooled VRAM.
On the bright side, 8GB should hopefully be sufficient to pull off 8k/4k supersampling[0] with less demanding titles (e.g. Cities: Skylines). Lackluster driver or title support for such stratospheric resolutions may prove to be an issue, though.
It's possible Nvidia is saving the 12GB configuration for a 1080 Ti model down the road. If they release a new Titan model, I'm guessing it'll probably weigh in at 16GB. Perhaps less if those cards end up using HBM2 instead of GDDR5X.
[0] https://en.wikipedia.org/wiki/Supersampling