Sorry for my bad english.
I have a AMD FX6300 Black and it wont work with any new grafik card I have tried. When I place a older Asus 6870 1GB card it works also with the onboard grafik card no problems. I have tried 3 motherboards (Asus and Gigabyte) and many other components like PSU,CPU and memory with no positif result to the grafik cards??
The cards I have tested are Gigabyte R7 260X OC 2GB, Asus GT640 2GB Silent, MSI GT630 2GB.
When look to the compatibel list of GPU there may not be any problems??
I haved send a Asus motherboard for RMA and received the same back.