Hi matteuz,
I'm also trying to install Yosemite with SFOTT, got an XFX Radeon HD 5770 card and trying to use it with the MacPro 1.1
So, I just want to ask you, did you flashed your card, and how did you get the EFI part?
There is so much discussion about it, I don't no where to start, do I have to flash it with some ROM's, or will it work (without boot screen) without flashing?
Thx,
yassi
Without the flash it will work just fine, just no bootscreen. The netkas website is full of useful info. Just beware not to use just some 5770 rom. It could stick your graphics card (happened to me). It's advised to search for the exact part number too, cause even within the same brand and types there are differences. But if you wanna stay on the safe side. Just use the card without the bootscreen, select the SFOTT USB-stick through the startup disk option in your OS X version.