For those not sure if they'll be able to run Mafia II on their pc's, 2K Games has released the PC specs for Mafia II. Be prepared to upgrade your pc, as they are quite high:
MINIMUM SYSTEM REQUIREMENTS[]
Operating System: Microsoft Windows XP (SP2 or later) / Windows Vista / Windows 7
Processor: Pentium D 3Ghz or AMD Athlon 64 X2 3600+ (Dual core) or higher
RAM: 1.5 GB
Video Card: nVidia GeForce 8600 / ATI HD2600 Pro or better
Hard Disc Space: 8 GB
Sound Card: 100% DirectX 9.0c compatible sound card
Peripherals: Keyboard and mouse or Windows compatible gamepad
RECOMMENDED SYSTEM REQUIREMENTS[]
Operating System: Microsoft Windows XP (SP2 or later) / Windows Vista / Windows 7
Processor: 2.4 GHz Quad Core processor
RAM: 2 GB
Video Card: nVidia GeForce 9800 GTX / ATI Radeon HD 3870 or better
Hard Disc: 10 GB
Sound Card: 100% DirectX 9.0c compliant card
Peripherals: Keyboard and mouse or Windows compatible gamepad
PHYSX/APEX ENHANCEMENTS SYSTEM REQUIREMENTS[]
Operating System: Microsoft Windows XP (SP2 or later) / Windows Vista / Windows 7 Minimum Processor: 2.4 GHz Quad Core processor
Recommended Processor: 2.66 GHz Core i7-920 RAM: 2 GB
Video Cards and resolution: APEX medium settings[]
Minimum: NVIDIA GeForce GTX 260 (or better) for Graphics and a dedicated NVIDIA 9800GTX (or better) for PhysX
Recommended: NVIDIA GeForce GTX 470 (or better)
Video Cards and resolution: APEX High settings[]
Minimum: NVIDIA GeForce GTX 470 (or better) and a dedicated NVIDIA 9800GTX (or better) for PhysX
Recommended: NVIDIA GeForce GTX 480 for Graphics and a dedicated NVIDIA GTX 285 (or better) for PhysX NVIDIA GPU driver: 197.13 or later.
NVIDIA PhysX driver: 10.04.02_9.10.0522. Included and automatically installed with the game.