Hey guys i just need to know if ATI video cards or compatible with Nvidia mobo? I just recently bought a HD 5670 and that didnt work, and with conclusion from 5 experts, they say it was that my PCI-E x16 wouldnt work with PCI-E 2.0. The day after i bought that i returned it and got a crappy Nvidia 9500 GT, along with a new power supply. That video card worked fine but it wasnt close to my expectations, so i then returned it for an ATI HD 4830. Now im back with the same problem as video card one. what should i do?