I read that it's going to be 9Gb/s memory.Better described as a GTX 1080 but with 8 Gb/s GDDR5 instead of 10 or 11 GDDR5X. The core is 5% cut but that is almost meaningless. Cut less than any GPU in memory, even less than 980 Ti.
Though I wonder if it will be cut in any other misleading ways. Like how GTX 1070 is 64 ROPs but with 3/4 GPCs resulting in only 48 of those ROPs being fed.