These are the recommended System Requirements that your computer should meet in order to run GTA 5 smoothly.
Operating System: Windows 7 or above (64-bit)
Processor: Intel Core i5 3470 @ 3.2GHZ (4 CPUs) / AMD X8 FX-8350 @ 4GHZ (8 CPUs)
Graphics Card: NVIDIA GTX 660 2GB / AMD HD7870 2GB
RAM: 8 GB
Sound Card: 100% DirectX 10 compatible
Hard Drive: 65GB