I have an radeon hd 8490 and need an modified bios that makes the motherboard have the “Backward Compatibility” function to make the 2.1 pci of the gpu go to 1.1, and then make the gpu be recognized and compatible in the motherboard, otherwise i think that the “backward compatibility” function is the “CSM” or the “Legacy ROM” function in newer PCI-EXPRESS modules of newer motherboards bios. Mine actual bios version is the 15.3 of 945GCM5-F V2 (MS-7267)