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portal 2
* OS: Windows XP, Vista or Windows 7
* CPU: Intel P IV @ 3 GHz or Dual core 2 GHz or AMD64X2 (or higher)
* RAM: 1GB XP or 2GB Vista/7
* HDD: 7.5 GB free disk space
* Graphics: 128 MB Graphics Memory with pixel shader 2.0
*...