Electronic Arts has just released the minimum system requirements for Spore. Pretty low specs as I am sure they are going after the mass market ala Sims. In typical PC fashion, make sure to double these if you want good performance.

System Requirements:

WINDOWS XP
- 2.0 GHz P4 processor or equivalent
- 512 MB RAM
- A 128 MB Video Card, with support for Pixel Shader 2.0
- At least 6 GB of hard drive space

WINDOWS VISTA
- 2.0 GHz P4 processor or equivalent
- 768 MB RAM
- A 128 MB Video Card, with support for Pixel Shader 2.0
- At least 6 GB of hard drive space

MAC OS X
- Mac OS X 10.5.3 Leopard or higher
- Intel Core Duo Processor
- 1024 MB RAM
- ATI X1600 or NVidia 7300 GT with 128 MB of Video RAM, or Intel Integrated GMA X3100
- At least 4.7GB of hard drive space for installation, plus additional space for creations.*

Spore is set to arrive on PC and Mac September 7, with a Nintendo DS edition, titled Spore Creatures, hitting on the same day.