With an impending release of Autodesk Inventor 2013, here are the system requirements for this new version. From what I can see, they are quite similar to the previous version 2012 so there are no surprises this time:
- Windows 7 (SP1) (32-bit or 64-bit) Home Premium, Professional, Ultimate, or Enterprise edition (recommended; Win7-64 recommended for large assemblies), Windows XP Professional (SP3), or Windows XP Professional x64 Edition (SP2); no Vista!
- Intel Pentium 4, 2 GHz or faster; Intel Xeon, Intel Core, AMD Athlon 64, or AMD Opteron or later processor
- 2 GB RAM (min. 1 GB for Inventor LT; 8 GB for complex models – more than 1.000 parts)
- Microsoft Direct3D 10 (recommended) or Direct3D 9 capable graphics card
- 1,280 x 1,024 or higher screen resolution
- Internet connection for web downloads and Subscription Aware access
- Adobe® Flash® Player 10
- Microsoft Mouse-compliant pointing device
- Internet Explorer 6.x through 9
- Excel 2003 through 2010 for iFeatures, iParts, iAssemblies, thread customization, and spreadsheet-driven designs
- Microsoft .Net Framework 4.0
Posted by 3dcad 
3D CAD 