hp compaq 8000 elite

hello friend i have a oem HP Compaq 8000 elite sff with Q6600 , 6gb ram DDR3 , GTX 750 2GB. but since i install this GPU on my Computer all games freezes and crashes randomly but i can still hear the sound from them until they closes! i tried everything from uninstalling drivers using DDU to...

So I wanted to add a GPU to my prebuild computer so I could game. The computer I have is something similar to this. The graphics card a bought is this, MSI GTX 760. I knew the PSU in the computer won't cut it so I also bought a Corsair RM 650X PSU, something like this. Then I figured out that...