Portal 2

Portal 2 Minimum System Requirements:
CPU - 1.7 GHz Processor
RAM - 512MB
Video Card - DirectX® 8.1 level Graphics Card (Requires support for SSE)
Windows® 7 (32/64-bit)/Vista/XP
Other - Mouse, Keyboard, Internet Connection

Portal 2 Recommended System Requirements:
CPU - Pentium 4 processor (3.0GHz, or better)
RAM - 1GB RAM
Video card - DirectX® 9 level Graphics Card