Here are the In Stars And Time System Requirements (Minimum)
CPU: Intel Core i3-530 (2 * 2930), AMD Phenom 9650 Quad-Core (4 * 2300), or equivalent
RAM: 4 GB
VIDEO CARD: GeForce GT 440 (1024 MB) or Radeon HD 7750 (1024MB)
DEDICATED VIDEO RAM: 1024 MB
PIXEL SHADER: 5.0
VERTEX SHADER: 5.0
OS: Windows 7 x64
FREE DISK SPACE: 500 MB