DotA 2 Minimum System Requirements: (DOTA2 minimum configuration requirements)
OS: Windows ® 7 / Vista / Vista64 / XP
Processor: Pentium 4 3.0GHz
Memory: 1 GB for XP / 2GB for Vista
Graphics: DirectX 9 compatible video Card with 128 MB, Shader Model 2.0. ATI X800, NVidia 6600 or better
Hard Drive: At least 2.5 GB of free space
Sound: DirectX 9.0c compatible Sound Card
Recommended System Requirements DotA 2: (DOTA2 recommended configuration requirements)
OS : Windows ® 7 / Vista / Vista64 / XP
Processor : Intel Core 2 Duo 2.4GHz
Memory : 1 GB for XP / 2GB for Vista
Graphics : DirectX 9 compatible with Shader Model 3.0 video Card. NVidia 7600, ATI X1600 or better
Hard Drive : At least 2.5 GB of free space Sound : DirectX 9.0c compatible sound card