In order for you to play Rust on macOS with minimal graphics settings, your computer must meet the following requirements
Operating System:
OS X El Capitan 10.11
Processor (CPU):
Intel Core i7-3770 / AMD FX-9590 or better
Memory (RAM):
10 GB RAM
Graphics Card:
GTX 670 2GB / AMD R9 280 better
Network:
Broadband Internet connection
Storage:
25 GB available space
In order to play Rust on macOS with maximum graphics settings, you need a computer with a configuration no worse than the following
Operating System:
OS X El Capitan 10.11
Processor (CPU):
Intel Core i7-4790K / AMD Ryzen 5 1600
Memory (RAM):
16 GB RAM
Graphics Card:
GTX 980 / AMD R9 Fury
Network:
Broadband Internet connection
Storage:
25 GB available space