In order for you to play X Rebirth on macOS with minimal graphics settings, your computer must meet the following requirements
Operating System:
OS X 10.9 Mavericks
Processor (CPU):
Intel i-Series at 2GHz or AMD equivalent
Memory (RAM):
8 GB RAM
Graphics Card:
Intel Iris Pro
Storage:
8 GB available space
Sound Card:
OpenAL Soft compatible
In order to play X Rebirth on macOS with maximum graphics settings, you need a computer with a configuration no worse than the following
Operating System:
OS X 10.10 Yosemite
Processor (CPU):
Intel i5 (Quad) or i7 at 2.5GHz or AMD equivalent
Memory (RAM):
12 GB RAM
Graphics Card:
Nvidia GT750M, Nvidia GT600 series with 1 GB RAM or better, AMD 6850HD with 1 GB RAM or better
Storage:
12 GB available space
Sound Card:
OpenAL Soft compatible