Sid Meier's Civilization V System Requirement

Minimum System Requirement:

OS:Windows XP (SP3),Windows Vista (SP2) and Windows 7
Processor:Intel Pentium Dual Core and above
RAM:2GB
VRAM:256MB
DirectX:9.0c
Hard Disk:8GB

Recommended System Requirement:
OS:Windows XP (SP3),Windows Vista (SP2) and Windows 7
Processor:Intel Pentium Core 2 Quad and above
RAM:4GB
VRAM:512MB
DirectX:9.0c
Hard Disk:12GB