Intel core i7-4790
RAM 12GB DDR3
PSU 600W 80Plus Bronze
GPU RX580 4GB Sapphire Nitro+
2TB HDD 7200
Windows 10 (1809)
so i bought the RX580 in january, since i got it i had bad problems with some games, so i tried everything to solve the problem, because at the beginning i noticed that the frecuency of the GPU memory was super unstable, but then, in GPU-Z i saw that the GPU was working at PCIe 2.0 1x ínstead of PCIe 3.0 16x.
So i checked if the GPU card was slightly out of the slot or something like that, but everything was okay, the GPU was fully connected into the PCIe.
so i dont know if the GPU is faulty or what.