Minimum System Requirements
Windows
OS:
Windows Vista Service Pack 2 32-bit
Processor:
Intel Core 2 DUO 2.4 GHz / AMD Athlon X2 2.7 GHz
Memory:
2GB
Graphics:
DirectX10 Compatible ATI Radeon HD 3870 / NVIDIA 8800 GT / Intel HD 3000 Integrated Graphics
Storage:
20 GB free
Notes:
DirectX Compatible
macOS
OS:
10.12 (Sierra)
Processor:
2.2 GHz Intel Core 2 Duo (Dual-Core)
Memory:
4 GB RAM
Graphics:
ATI Radeon HD 3870 / NVidia Geforce 640M / Intel HD4000
Storage:
30 GB
Notes:
BioShock Infinite supports both the Microsoft Xbox 360 wired gamepad and the PlayStation 3 Dualshock 3 Wireless Controller in addition to the Macintosh mouse and keyboard
Linux
OS:
Ubuntu 14.10, Mint 17.1 or similar Linux distribution
Processor:
Intel Core 2 DUO 2.4 GHz / AMD Athlon X2 2.7 GHz
Memory:
4GB
Graphics:
NVidia/AMD OpenGL 4.1/DirectX 10.0 level compatible
Storage:
20 GB Free
Notes:
ALSA/PulseAudio compatible
Recommended System Requirements
Windows
OS:
Windows 7 Service Pack 1 64-bit
Processor:
Quad Core Processor
Memory:
4GB
Graphics:
DirectX11 Compatible, AMD Radeon HD 6950 / NVIDIA GeForce GTX 560
Storage:
30 GB free
Notes:
DirectX Compatible
macOS
OS:
10.12 (Sierra)
Processor:
2.2 GHz Intel Core 2 Duo (Dual-Core)
Memory:
4 GB RAM
Graphics:
ATI Radeon HD 5870 / NVidia Geforce GTX 775M
Storage:
30 GB
Linux
Processor:
Intel Core i5 3GHz (or similar AMD processor)
Memory:
8GB
Graphics:
NVidia/AMD OpenGL 4.2/DirectX 10.1 level compatible
Storage:
30 GB Free
These are the requirements the publisher lists on Steam.