From Dust

Minimum  requirements
Supported OS          : Windows XP (SP3) / Windows Vista (SP2) / Windows 7 (SP1)
Processor                : 1.8 GHz Intel Core 2 Duo or 2.3 GHz AMD Athlon64 X2 4400+
RAM                           : 1.5 GB  (Windows XP) / 2 GB (Windows Vista/Windows 7)
Video Card               : 256 MB DirectX  9.0c-compliant card with Shader Model 3.0 or higher (*see supported list)
Sound Card              : DirectX 9.0-compliant sound card
DirectX Version      : DirectX 9.0c
Hard Drive Space   : 4 GB
Peripherals Supported: Keyboard, mouse, optional controller

Recommended requirements:
Processor                : 2.66 GHz Intel Core i7 920 or 3.0 GHz AMD Phenom II X4 or better
Video Card              : 512 MB Geforce 9 or Radeon HD 4000 (*see supported list)
Sound Card              : 5.1 sound card
Peripherals              : Keyboard, mouse, joystick optional (Xbox 360 Controller for Windows recommended)

*Supported Video Cards at Time of Release:
ATI RADEON  HD 3000 / 4000 / 5000 / 6000 seriesNVIDIA GeForce 8800 / 9 / 100 / 200 / 300 / 400 / 500 series

From Dust Trailer