In order for you to play Guns of Icarus Online on macOS with minimal graphics settings, your computer must meet the following requirements
Operating System:
Mac OS X 10.6
Processor (CPU):
2 GHz processor
Memory (RAM):
2 GB RAM
Graphics Card:
Intel HD3000, Nvidia GeForce GT8600 or equivalent
Hard Drive:
3 GB HD space
Other Requirements:
Broadband Internet connection