Given already that we now know that the 2010 mac pro is NOTHING more than a full breaded 2009 just with westmere firmware and new GPUS, I am happy to report that the following has now been confirmed:
THE EFI ROM IS ON THE BACKPLANE OF THE 2010.. BY REMOVING THE 09'S backplane board and replacing with the 2010's, THE 09 can now recognize westmere.. The processor tray was the same in the 09.. as westmere processors will fit in the same socket.. As you have noticed, the same part number for the single quad processor tray is the same for both 09 and 10..
SO, YES... THE 09 IS NOW A WESTMERE... This was also tested with the dual setup as well. So, there you have it. The EFI ROM is on the backplane board.. replace that, and you have the westmere..
The board can be had between 250-350 depending on the place you can find it. Applecomponents.com has the board for close to 300.. but it is WELL worth it for those not wanting to spend over 3000 or more for a "new" mac pro..
Yes, the processors are expensive, but at least the possibility of getting westmere from a 250-300 dollars board is NOW IN REACH for everyone.