Windows 7 RC – Minimum system requirements

Now that Windows 7 RC is available for all to download, check this what you need :

• Internet access (to download Windows 7 RC and get updates)

• A PC with these system requirements:

  • 1 GHz or faster 32-bit (x86) or 64-bit (x64) processor

  • 1 GB RAM (32-bit) / 2 GB RAM (64-bit)

  • 16 GB available disk space (32-bit) / 20 GB (64-bit)

  • DirectX 9 graphics processor with WDDM 1.0 or higher driver

  Please note these specifications could change. And, some product features of Windows 7, such as the ability to watch and record live TV or navigation through the use of "touch," may require advanced or additional hardware.

Source: http://www.microsoft.com/windows/windows-7/download.aspx

As I have been using it since its beta and also running the RC since few days now, I can tell you Windows 7 RC runs smoothly even with  512MB RAM  (32-bit), and it can also be installed on a 8GB HD. As after installation it occupies nearly 6.5GB (32-bit). So once installed, for running and installing other Apps, it will require more space. So even if you have a lesser System, you can give it a try. Of course, if you meet the specified System requirements, then you can enjoy all the cool features of Windows 7.