I have upgraded my 2,66 GHz Woodcrest MP with a pair of 3,0 GHz X5365 Clovertown Xeons. So to my best knowledge it is now a genuine MacPro2,1 model unless I'm missing something. Although they did not make known hardware changes beyond the CPUs Apple issued new firmware for the MP2,1 and I suspect that there are a couple of compatibility improvements that may benefit my machine. At minimum I could get the correct name and the new model number into the profiler. I found a 2,1 firmware in the firmware CD #14 but I don't know how to load that onto the system EEPROM. The procedure says that you hold the power button depressed until the system gave nine beeps with different speed. My system is ok and it does not do this. Perhaps there is an integrity check in the EFI which runs the firmware upgrade routine only if the EFI is corrupted. I suspect that there are alternative methods to load an EFI file into the system EEPROM. So if someone here knows another method, please share your information.