The mobile version of GeForce GTX 1080 limited to GDDR5 memory, and the number of functional units will be reduced compared with the desktop version. As I explained Golem.de site, the mobile version of GeForce GTX 1080 combines 2048 stream processors and 256-bit bus and TDP value has been reduced from 185 to 120 watts.
If we talk about the mobile version of GeForce GTX 1070, it is satisfied with 1920 stream processors and 256-bit bus and TDP value does not exceed 85 watts. Characteristics of the mobile version GeForce GTX 1060 already voiced before - it has retained a 192-bit bus, and GPU frequencies are reduced to 1405/1671 MHz. Meaning TDP managed to keep within the limits of 65 watts.
Along the way, it is reported that Polaris 11 (Baffin) in the mobile version saves 1024 stream processors and 128-bit bus.