The basic system requirements are as follows

Required: Internet connection required to install and play.
OS: Windows XP SP3 / Vista SP1 / Windows 7
Processor: Intel Core 2 or better / AMD 64 X2 or better
Memory: 1 GB for XP / 1.5 GB for Vista and Windows 7
Hard Drive: At least 10 GB of free space
DVD-ROM: 8x Speed
Video Card: 256MB RAM with support for shader model 3*
Sound Card: Direct X 9.0c compatible
DirectX: Version 9.0c (included)
Online: 2 - 10 Players
Input: Keyboard, Mouse, VOIP headset
Supported video cards: Nvidia GeForce 6800 or better, ATI Radeon X1600 or better. Laptop versions of these chipsets may work but are not supported. Updates to your video and sound card drivers may be required.