first, sorry for my english. I installed yosemite with no problem at first try. I installed the kexts for the lan and the Audio, perfect. But i can no get the Atiu hd 4770 detected so it is using a 3mb card and it makes the OsX unusable, I have read that there are no kexts for that card but always where posts of 2010-2011. Nowadays it is posible to make that card work? How can i do it? Where can i get the texts? maybe an option in the loader?