When GTA V came out for PC in 2015 I think, I had a computer with a low graphics card but it played GTA V ok, just the graphics were low.  Minimum requirements for V are 2gb Vid Mem but I had a Radeon HD 5870 with 1gb mem.  Ran the game but and I got used to the low graphics.  Everything else on my computer was above min req.  I had 9gb RAM, Win 7, i7 processor at 2.8 GHz I think it was.   Recently I got a new computer and paid extra for a decent graphics card and got a GeForce GTX 1070 Ti with