In order for you to play Serious Sam 3: BFE on macOS with minimal graphics settings, your computer must meet the following requirements
Operating System:
OS X version Leopard 10.5.8, Snow Leopard 10.6.3, or later.
Processor (CPU):
Intel Core 2 Duo 2.0 GHz
Memory (RAM):
2 GB
Hard Disk Space:
6 GB
Video Card:
nVidia GeForce GT 120/9600M/320M, or ATI (AMD) Radeon HD 4670. Intel integrated GPUs are not supported.
In order to play Serious Sam 3: BFE on macOS with maximum graphics settings, you need a computer with a configuration no worse than the following
Processor (CPU):
Intel i3/i5 Quad Code 2.7+ GHz
Memory (RAM):
4 GB
Hard Disk Space:
6 GB
Video Card:
nVidia GeForce 8800/9800/260, or ATI (AMD) Radeon HD 4870