So I bought the PC part and built it. Then I installed all the drivers. After that, I installed GTA 5 and it was lagging!
PC Specs :
GPU : EVGA GTX 750 TI Super-clocked
CPU : AMD Athlon 5350
Ram : 4GB
Motherboard : MSi AM1I
PSU : Nvga 400w Power supply
P.S - All the settings are on the lowest
That processor isn't meant to game a whole lot, it's slowing your system down. Also, to run GTA V optimally, you want at least 8GB of RAM.