A recent trick we described generated a lot of interest among Mac Pro owners (all generations included): flashing a PC Radeon HD 48x0 to work in a Mac. So, far the procedure (partially described here), required CD Freedos to access Atiflash tool.Thanks to Apple and the recent firmware update of some Radeon installed in iMac, we obtain a Mac version of Atiflash. The procedure is available already in English (we will not comment it further before having it fully tested): http://boeglin.org/blog/index.php?entry=entry090918-031702 In summary, it requires the firmware update of an iMac, Pacifist to extract archive, firmware dedicated to HD 4870/4890 and a couple of command lines to enter in the Terminal. We currently do not know if it will work for all PC Radeon HD 48x
