System Requirements for Unity Authoring Windows: XP SP2 or later; Mac OS X: Intel CPU & "Leopard" 10.5 or later. Note that Unity was not tested on server versions of Windows and OS X. Graphics card with 64 MB of VRAM and pixel shaders or 4 texture units. Any card made in this millennium should work. Using Occlusion Culling requires GPU with Occlusion Query support (some Intel GPUs do not support that). The rest only depends on the complexity of your projects!.

System Requirements for Unity iOS Authoring An Intel-based Mac Mac OS X "Snow Leopard" 10.6 or later The rest only depends on the complexity of your projects!

System Requirements for Unity Android Authoring In addition to the general system requirements for Unity Authoring Windows XP SP2 or later; Mac OS 10.5.8 or later Android SDK and Java Development Kit (JDK)

System Requirements for Unity-Authored Content Windows 2000 or later; Mac OS X 10.4 or later. Pretty much any 3D graphics card, depending on complexity. Online games run on all browsers, including IE, Firefox, Safari, and Chrome, among others. Android authored content requires devices equipped with: Android OS 2.0 or later Device powered by an ARMv7 (Cortex family) CPU GPU support for OpenGLES 2.0 is recommended