Low FPS On New Gaming PC

[MichaeI12]

I bought a $900 pre - built by dell but i'm having very bad FPS on alot of games ( GTA 5, Arma 3, Trucking Simulator.) I have updated drivers and used recommend graphics by GeForce Experience, but it did no good. Even when over clocked.
All games are in standard/ low graphics.
Specs:
Processor Intel Core i5-6400 [6th Generation Intel Core i5-6400 Processor (6M Cache, up to 3.3 GHz)]
Operating System - Windows 10
Memory -8GB, - 2133MHz - DDR4
Video Graphics - NVIDIA GeForce GTX 1070 with 8GB GDDR5 Graphics Memory

 

[hang-the-9]

Very bad FPS like what? Is the monitor connected to the video card or to the motherboard video?