http://store.steampowered.com/app/243870/

Minimum:
OS: Windows Vista SP2, Windows 7 SP1, Windows 8/8.1 (32/64bit versions)
Processor: Intel Pentium Dual-Core E2140 @ 1.6 GHz or AMD Athlon64 X2 3800+ @ 2.0 GHz (or better)
Memory: 3 GB RAM
Graphics: nVidia GeForce 8600 GT or AMD Radeon HD2600 XT (256MB VRAM with Shader Model 4.0 or higher)
DirectX: Version 9.0c
Network: Broadband Internet connection
Hard Drive: 6 GB available space
Sound Card: DirectX 9.0c compliant sound card
Additional Notes: Requires Microsoft .NET Framework 3.5 SP1 and Internet Explorer 9 (Windows Vista/Windows 7)

Recommended:
OS: Windows Vista SP2, Windows 7 SP1, Windows 8/8.1 (64bit)
Processor: Intel Core2 Duo E6850 @ 3.0 Ghz or AMD Phenom II X2 545 @ 3.0 Ghz or higher
Memory: 4 GB RAM
Graphics: nVidia GeForce GTX260 or AMD Radeon HD4870 (512MB VRAM with Shader Model 4.0 or higher)
DirectX: Version 9.0c
Network: Broadband Internet connection
Hard Drive: 6 GB available space
Sound Card: 5.1 sound card
Additional Notes: Requires Microsoft .NET Framework 3.5 SP1 and Internet Explorer 9 (Windows Vista/Windows 7)

http://ghost-recon.ubi.com/ghost-recon-phantoms/en-US/support/technical/