Minimum Grand Theft Auto V requirements:

Processor: Intel Core 2 Duo 2.6 Ghz or equivalent
Memory/RAM: 2 GB Ram
Video Card: 512MB NVIDIA 7900 or 512MB ATI X1900
Hard Disk Space: 30 – 40 GB
Operating System: Windows XP SP3 or Windows Vista SP1 or Windows 7 SP1
Recommended system requirements:

CPU: Intel Core 2 Quad 3.66GHz or equivalent AMD
RAM: 4 GB
Video Card (GPU): NVIDIA GTX 480 or similar ATI
Hard Disk Space: 40 GB free HDD
Operating System: Vista SP 2 or Window 7 – 8 SP 1