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The Windows Server 8 Beta builds are now available for download.  Upgrades from previous builds are not supported or recommended.

http://msdn.microsoft.com/en-us/evalcenter/hh708764.aspx

Note: 32 GB should be considered an absolute minimum value for successful installation. Computers with more than 16 GB of RAM will require more disk space for paging, hibernation, and dump files. Drive DVD-ROM drive Display and Peripherals • Super VGA (800 x 600) or higher-resolution monitor • Keyboard • Microsoft Mouse or other compatible pointing device

*Actual requirements will vary based on your system configuration and the applications and features you choose to install. Processor performance is dependent upon not only the clock frequency of the processor, but the number of cores and the size of the processor cache. Disk space requirements for the system partition are approximate. Additional available hard-disk space may be required if you are installing over a network.