Official specs from Steam

Mafia III system requirements

Minimum and recommended PC specs as listed by the developer on Steam. Native macOS version available.

Mafia III release info Steam page Check other games

Minimum

Note	Requires a 64-bit processor and operating system
OS *	Windows 7 64-bit
Processor	Intel I5-2500K, AMD FX-8120
Memory	6 GB RAM
Graphics	2GB of Video Memory & NVIDIA GeForce GTX 660, AMD Radeon HD7870
Storage	50 GB available space
Sound Card	DirectX Compliant Sound card
Additional Notes	Windows 8.1 users may need additional Windows Update files: Please Click here for information

macOS minimum

OS	MacOS 10.12.4
Processor	Intel Core i5 (4 Cores) 3.2 GHz
Memory	8 GB RAM
Graphics	AMD Radeon R9 M290X 2GB VRAM
Storage	50 GB available space
Additional Notes	NOTICE: NVIDIA and INTEL video cards are NOT SUPPORTED to run Mafia III Mac NOTICE: The game requires a minimum 2GB AMD video card. These are the ONLY supported Mac models: AMD FirePro D300, dual AMD FirePro D500, or dual AMD FirePro D700 (late 2013 MacPro) AMD Radeon R9 M290X or Radeon R9 M295X (late 2014 iMac) AMD Radeon R9 M380, M390, M395, or M395X (late 2015 iMac) AMD Radeon R9 M370X (mid 2015 and 2016 MBP) AMD Radeon Pro 450, 455, or 460 (late 2016 MBP) NOTICE: This game is not supported on volumes formatted as Mac OS Extended (CaseSensitive)

FAQ

What graphics card do I need for Mafia III?

Minimum: 2GB of Video Memory & NVIDIA GeForce GTX 660, AMD Radeon HD7870. Recommended: 4GB of Video Memory & NVIDIA Geforce GTX 780 or GeForce GTX 1060, AMD Radeon R9 290X.

How much RAM does Mafia III need?

Mafia III needs 6 GB RAM at minimum, 8 GB RAM recommended.

How big is Mafia III?

Mafia III requires 50 GB available space.

Does Mafia III run on Mac or Steam Deck/Linux?

Yes, there is a native macOS version. There is no native Linux build (Proton compatibility may vary).