Just Cause 2 Minimum pc Requirements:
OS: Windows Vista or Windows 7 (Windows XP is unsupported)
CPU: Dual-core CPU with SSE3 (Athlon 64 X2 4200 / Pentium D 3GHz)
Video Card: Nvidia Geforce 8800 Series / ATI Radeon HD 2600 Pro with 256MB memory or equivalent DX10 card with 256MB memory
Memory: 2GB RAM
DirectX: Microsoft DirectX 10
Hard Drive: 10GB of free drive space
Optical Drive: DVD-ROM drive
Sound Card: 100% DirectX 10 compatible sound card
Internet Connection: Internet connection required for product activation
Input: Keyboard and mouse (Microsoft Xbox 360 controller optional)

Just Cause 2 Recommended pc Requirements:
OS: Microsoft Windows Vista or Windows 7 (Windows XP is unsupported)
CPU: Intel Core 2 Duo 2.6GHz or AMD Phenom X3 2.4GHz Processor
Video Card: Nvidia GeForce GTS 250 Series with 512MB / ATI Radeon HD 5750 Series with 512MB or equivalent DX10 card with 512MB memory
CPU: 3GB Memory
DirectX: Microsoft DirectX 10.1 with Vista SP1
Hard Drive: 10GB of free drive space
Optical Drive: DVD-ROM drive
Sound Card: 100% DirectX 10 compatible Dolby Digital 5.1 sound card
Internet Connection: Internet connection required for product activation
Input: Keyboard and mouse (Xbox 360 controller optional)

Minimum System Requirements

Processor : Intel Pentium 4 at 3.2 Ghz / Intel Pentium D at 2.66 Ghz / AMD Athlon™ 64 3500+ or better
Video Card : 256 MB DirectX 9.0-compliant card with Shader Model 3.0 support.
Memory : 1 GB for Windows XP / 2 GB for Windows Vista, Windows 7
Hard Disk
: 4 GB of free Hard Disk Space
Operating System
: Microsoft Windows XP / Windows Vista /Windows 7
Sound Card : DirectX 9.0 compliant sound card
Direct X : DirectX 9.0 / DirectX 10.0
Gameplay : Windows Compatible Keyboard & Mouse
Installation : DVD-ROM Drive
Network : 128 kbps Broadband connection

Recommended System Requirements:

Processor : Intel Core 2 Duo Family / AMD Athlon™ 64 X2 5200+ or better
Video Card : 512 MB DirectX 10.0-compliant video card or DirectX 9.0-compliant card with Shader Model 3.0 or higher support. (**See Supported List)
Memory : 2 GB
Hard Disk : 4 GB of free Hard Disk Space
Operating System : Microsoft Windows XP / Windows Vista /Windows 7
Sound Card : DirectX 9.0 compliant 5.1 sound card
Direct X : DirectX 9.0 / DirectX 10.0
Gameplay : Windows Compatible Keyboard & Mouse
Installation : DVD-ROM Drive
Network : 256 kbps Broadband connection

Note :SUPPORTED VIDEO CARDS AT TIME OF RELEASE: ATI® RADEON® 1650-1950 /
HD 2000/3000/4000 series NVIDIA GeForce 200 series and 6800/7000/8000/9000
series * 8800M and 8700M laptop cards are supported. Other laptop versions of the cards listed above may work but are NOT supported.
Laptop models of these cards may work but are not supported.