Here are the official system requirements for Red Faction: Guerrilla from THQ.

Minimum Requirements

• OS: Windows XP / Vista
• CPU: 2.0 GHz Dual-Core Processor (Intel Core 2 Duo or AMD Athlon X2)
• Memory: 1 GB RAM / 15 GB of Hard Drive space
• Video Card: 128 MB 3D Video Card w/Shader Model 3.0 Support (Nvidia GeForce 7600/ATI Radeon X1300)

Recommended Requirements

• OS: Windows Vista® for DirectX® 10
• CPU: 3.2 GHz Dual-Core Processor (Intel Core 2 Duo or AMD Athlon X2)
• Memory: 2 GB RAM / 15 GB of Hard Drive space
• Video Card: 256 MB 3D Video Card