Battlefield 3 will function the maximalist combined biceps battles that created the series well-known across single-player, co-operative and multiplayer modes. It will reintroduce several elements absent from the Bad Business games, including jet fighter jets, the inclined position and 64-player struggles on PC.
  Minimum System Requirements:

CPU: 2 GHZ DUAL CORE (CORE 2 DUO 2.4 GHZ OR ATHLON X2 2.7 GHZ) CPU: QUAD-CORE CPU

RAM: 2 GB RAM: 4 GB

VGA: AMD: DIRECTX 10.1 COMPATIBLE WITH 512 MB RAM (ATI RADEON 3000, 4000, 5000 OR 6000 SERIES, WITH ATI RADEON 3870 OR HIGHER PERFORMANCE)

NVIDIA: DIRECTX 10.0 COMPATIBLE WITH 512 MB RAM (NVIDIA GEFORCE 8, 9, 200, 300, 400 OR 500 SERIES WITH NVIDIA GEFORCE 8800 GT OR HIGHER PERFORMANCE) VGA: DIRECTX 11 COMPATIBLE WITH 1024 MB RAM (NVIDIA GEFORCE GTX 560 OR ATI RADEON 6950)

DX: DIRECTX 10.0 DX: DIRECTX 11

OS: WINDOWS VISTA (SERVICE PACK 2) 32-BIT OS: WINDOWS 7 64-BIT

HDD: 20 GB HDD: 20 GB

Sound: DIRECTX COMPATIBLE Sound: DIRECTX COMPATIBLE

ODD: DVD ROM DRIVE ODD: DVD ROM DRIVE

Recommended peripheral: KEYBOARD AND MOUSE

            For more info  Click