flash video card

I have an old ATi 5770 card which was reflashed to work in a Mac Pro 1.1 - I briefly tried it in a hack but it does not display correctly (colours askew, lack of available resolutions). Should this card now be reflashed again in order to use in a hack?

I'm a noob at tinkering with Mac OSX hardware, and I'm in need of some advice/assistance: The video card in my Mac Pro 1,1 (2006, 2x2.66gHz Xeon quad-cores - total 8x cores, 10 GB RAM, 2TB HDDs) was recently upgraded to a PC-based Sapphire Radeon HD6570 1GB. It's been plug and-play, and I've...