To run the GTA 5 requirements for PC, you will need an NVIDIA GeForce 9800 GT graphics card, an Intel Core 2 Quad Q6600 CPU, 4GB of RAM, and 110GB of HD space.
GTA 5 initially launched on consoles in September 2013, and didn't see a PC release until April 2015. As a result, the GTA 5 PC requirements are fairly low when compared to other major releases in 2015.
The GTA 5 minimum requirements only require an AMD HD 4870 GPU, an Intel AMD Phenom 9850 processor, amd 4GB of RAM.