Portal 2 Minimum System Requirements

OS: Windows 7 / Vista / XP

CPU: 3.0 GHz P4, Dual Core 2.0 (or higher) or AMD64X2 (or higher)

RAM: 1GB XP / 2GB Vista

GFX: ATI Radeon X800 or higher / NVIDIA GeForce 7600 or higher / Intel HD Graphics 2000 or higher. (128 MB or more and should be a DirectX 9-compatible with support for Pixel Shader 2.0b)

HDD: 8 GB

Audio: DirectX 9.0c compatible

Portal 2 Mac Minimum System Requirements

OS: MAC OS X 10.6.6 or higher

CPU: Intel Core Duo Processor (2GHz or better)

RAM: 2GB

GFX: ATI Radeon 2400 or higher / NVIDIA 8600M or higher

HDD: 8GB