Just got a Sapphire x1900xt 512M, and want to flash it to Mac Rom and use in my Quad. I have x1950 256M Mac ROM from this forum. Is it possible to use this ROM to flash the card(though it has 512M video mem)? where could I find x1900xt 512M Mac ROM, or how could I edit the x1950 256M Mac ROM to change the size of its video mem? Thank you.