Xanthochroi

Hi guys. So i bought an "asus ex a320m GAMING" mobo with an athlon200ge cpu. So I got a hd 6570 lying around and decided to use it as a place holder. It worked okay. Then i swapped it with a 9800 GT (which i know it works on other computers) but my mobo doesn't detect it. So i swapped with another nvidia card (GT 210 and 9600 GT) and still the mobo didn't detected it. All are working on another computer. So I decided to swap it back to the 6570 and it worked fine. Everything is just a place holder except for the mobo. I need to know if my mobo only support amd cards because I'm saving up for a better gpu. I wanna buy an nvidia card but i don't if it works on the mobo. Tech noob here. I have an Asus ex a320m gaming 500 watt psu Athlon 200ge 4gb ddr4 2400 I wanna know what the problem is. i fiddled with the bios and the connections for the past 4 days still none works