Win8.1 Pro BIT OEM KEY (Lifetime)

System Requirements

CPU: 1 GHz with NX, PAE, and SSE2 support (CMPXCHG16b, PrefetchW, and LAHF/SAHF support for 64-bit versions)
RAM:

• 1 GB 32-bit version
• 2 GB for the 64-bit version

Hard Drive: 16 GB free space (20 GB free for 64-bit versions)
Graphics: A GPU that supports at least DirectX 9 with a WDDM driver

Also, your optical drive will need to support DVD discs if you plan on installing Windows 8 using DVD media.

There are also several additional hardware requirements for Windows 8 when installed on a tablet.