We just talked about the GTX 1060 with faster memory, a 1080 model is present with 11 Gbps GDDR5X memory as well, actually two of them and both from the Aorus series.... Gigabyte Aorus GTX 1080 Graphics Cards with 11 Gbps GDDR5X Memory
I wonder if these are just 1080 Ti Boards/chips that failed and are lasercut into "normal" 1080's.. could be interesting to check out sometime ^^
Hyper-production of everything based on 10xx - NV and it's partners struggle to get rid of the chips and make space for the next gen (according to some gossip, next NV GPU could arrive at the beginning of autumn).