You can disable the 1080 in macOS and you can disable the AMD card in Win10. The disabled card won't draw any power, if anything very negligible amount. ​.
DOWNLOAD: https://tinurli.com/2fccic
DOWNLOAD: https://tinurli.com/2fccic
amd-for-mac
Feb 7, 2020 — Code from the latest version of the MacOS suggests that future desktop machines from Apple may use AMD processors for future Mac ... 939c2ea5af