Alien Swarm Minimum System Requirements:
o OS: Windows® 7 / Vista / Vista64 / XP
o Processor: Pentium 4 3.0GHz
o Memory: 1 GB for XP / 2GB for Vista
o Graphics: DirectX 9 compatible video card with 128 MB, Shader model 2.0. ATI X800, NVidia 6600 or better
o Hard Drive: At least 2.5 GB of free space
o Sound: DirectX 9.0c compatible sound card

Alien Swarm Recommended System Requirements:
o OS: Windows® 7 / Vista / Vista64 / XP
o Processor: Intel core 2 duo 2.4GHz
o Memory: 1 GB for XP / 2GB for Vista
o Graphics: DirectX 9 compatible video card with Shader model 3.0. NVidia 7600, ATI X1600 or better
o Hard Drive: At least 2.5 GB of free space
o Sound: DirectX 9.0c compatible sound card