In order for you to play Call of Duty: Black Ops III on macOS with minimal graphics settings, your computer must meet the following requirements
Operating System:
10.13.6 (High Sierra) or later
Processor (CPU):
Intel® Core™ i5 (4 Cores) @ 2.3 GHz
Memory (RAM):
8 GB RAM
Graphics Card:
ATI® Radeon™ M295X @ 2GB
Network:
Broadband Internet connection
Storage:
150 GB available space