Hi W1zzard! Actually there is two ROM image in the GTX580 EEPROM chip. For dumpping the GTX580 BIOS, there is an additional condition(offset) needs to be check: "Indicator" byte in the PCI Data Structure area , normally this byte = 0x80, means "Last image", but in GTX580 BIOS, this byte = 0x0 ! It means that there is another image follows! PCIRaddress = word ptr [0x18] IndicatorAddress = PCIRaddress + 0x15 I've got two GTX580 BIOS dump by GPUZ, the second image has been ignored.