Hey guys, after a lot of testing we have managed to clear everything around the topic of flashing stock PC X1900XT/512Mb (256Mb is NOT working!!) with MacPro EFI ROM. Thank you all guys at Strangedogs! It WORKS prefectlly! Ofcourse flashing card with MacPro EFI rom reenders card useless in regular PC, you have to flash it back with original bios to make it work in PC again. Link to topic on strangedogs: http://strangedogs.proboards40.com/...ments&action=display&thread=1158739989&page=5 !BE ADVISED: BAD FLASH WILL MEAN YOUR GPU WILL BE UNUSABLE! SO BE CAREFULL! BE SHURE YOU MAKE A BACKUP OR ORIGINAL ROM! YOU HAVE BEEN WARNED!