Sorry, the flashing utility is only for PC-DOS. You can use any old PC with PCI slots, so it won't cost much. You will need a DOS boot floppy and internet access to download the utility and ROM files to the floppy. You can do that from a Mac with a USB floppy drive. Instructions are on TheMacElite website. There is an NVidia updater for OS 9, but it won't flash a PC card, the card has to be flashed to Mac first from a PC, and I have had no luck with the Mac utility at all.