Only the GPU that came with the motherboard. Everything worked fine with that GPU but games were unplayable due to lag. I think I'm going to get a PC tech to take a look at the PC today. I'm afraid it might get damaged from restarting all the time.
When you put the old GPU back in does it work fine?
If so, what kind of PSU do you have? If the old GPU works and you have sufficient power, you should exchange your video card for a new one.