Hardware Requirements for Windows 8-For Install Windows 8

 
As of Windows 8 Release Preview, the minimum system requirements are the same as Windows 7 (except for CPU); these system requirements may change in the final release.

Minimum hardware requirements for Windows 8 Release Preview

Architecture	IA-32 (32-bit)	x86-64 (64-bit)
Processor	1 GHz (with PAE, NX and SSE2 support)
Memory (RAM)	1 GB	2 GB
Graphics Card	DirectX 9 graphics device with WDDM 1.0 or higher driver
Storage	16 GB	20 GB

To run Metro-style apps, a screen resolution of 1024x768 or higher is required to run one app at a time, and a resolution of 1366x768 is required to run two apps side-by-side using snap.