Portal 2
Valve
 95
Minimum: 53
CPU: 
3.0 GHz P4, Dual Core 2.0 (or higher) or AMD64X2 (or higher)
GPU: 
Video card must be 128 MB or more and with support for Pixel Shader 2.0b (ATI Radeon X800 or higher / NVIDIA GeForce 7600 or higher / Intel HD Graphics 2000 or higher).
RAM: 2.0 GB
Storage: 8.0 GB
OS: 
Windows 7 / Vista / XP
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Requirements
Portal 2
Valve
Minimum: 53
CPU: 
3.0 GHz P4, Dual Core 2.0 (or higher) or AMD64X2 (or higher)
GPU: 
Video card must be 128 MB or more and with support for Pixel Shader 2.0b (ATI Radeon X800 or higher / NVIDIA GeForce 7600 or higher / Intel HD Graphics 2000 or higher).
RAM: 2.0 GB
Storage: 8.0 GB
OS: 
Windows 7 / Vista / XP
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For Mac
Click on the Apple button on the top left corner, and click "about this Mac". A window with the specs of your Mac should appear.
For Windows
Type dxdiag in the search bar in the Windows menu and click dxdiag. Click on the "Display" tab of the dxdiag window to see your graphics card information.
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