Here are the initial projected requirements for Red Faction: Armageddon. This is not expected for release until early 2011 so system requirements are likely to change.

Red Faction Armageddon System Requirements

• CPU: 2GHz Dual Core Processor (Intel Core 2 Duo or Athlon X2) or higher
• RAM: 2GB System RAM or more
• GPU: 256MB GPU w/ Shader Model 3.0 support, GeForce 8xxx or Radeon HD3xxx series or better