Guess you don't know about the system requirements mentioned on the Unity website. So, here they are:
**System requirements**
1. Windows: XP SP2 or later; Mac OS X: Intel CPU & "Snow Leopard" 10.6 or later. Note that Unity was not tested on server versions of Windows and OS X.
2. Graphics card with DirectX 9 level (shader model 2.0) capabilities. Any card made since 2004 should work.
3. List item
Using Occlusion Culling requires GPU with Occlusion Query support (some Intel GPUs do not support that).
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