Bioshock 2 - System Requirements

Game - Bioshock 2
Publisher - 2K Games
Developer - 2K Marin
Engine - Unreal 2.5
Platform - PC, 360, PS3
Release Date - 09 February 2010

Minimum requirements:

• OS: Windows XP / Vista / Windows 7
• Processor: AMD Athlon 64 Processor 3800 2.4 Ghz or better / Intel Pentium 4 530 3.0 Ghz processor or better
• Memory: 2GB
• Graphics: NVIDIA 7800GT 256MB graphics card or better, / ATI Radeon X1900 256MB graphics card or better
• DirectX: DirectX 9.0c
• Hard Drive: 11GB
• Sound: 100% DirectX 9.0C compliant sound card or onboard sound

Recommended:

• Processor: AMD Athlon 64 X2 5200+ Dual Core 2.60 Ghz / Intel Core 2 Duo E6420 Dual Core 2.13 Ghz
• Memory: 3GB
• Graphics: NVIDIA 8800GT 512 MB graphics card or better /ATI Radeon HD4830 512MB graphics card or better

Source
-kotaku.com