Graphics: A reasonably modern graphics card (Direct3D 10.0 / OpenGL 3.0).
A modern CPU (3 GHz and Dual Core, not older than 2008) is highly recommended. Windows Vista SP2 and unix-like systems other than Linux are not officially supported but might work. Generally, these are the minimum recommended requirements for Dolphin. Every game has different requirements, some titles may require a powerful computer while some other titles may not.