Windows 8 Minimum Requirements

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The minimum system requirements for the Windows 8 is given below:-

Minimum hardware requirements for Windows Developer Preview

Architecture x86 (32-bit)
or x86-64 (64-bit)

Processor:
1 GHz x86 processor
1 GHz x86-64 processor

Memory (RAM):
1 GB 2 GB

Graphics Card:
DirectX 9 graphics processor with WDDM driver model 1.0
(Not absolutely necessary; only required for Aero hardware
acceleration. Graphics processors with no WDDM support will fall back to Microsoft's Basic Display Adapter driver which supports software rendering of Windows Aero.)

HDD free space:
16 GB of free disk space
20 GB of free disk space