Hello! I am very sad , today I installed the Nvidia GTX 690 4GB in my MAC PRO 5.1. I use OSX 10.9.5 (build 13F1712). the mac homescreen is not seen until entering the desktop. I look the Sistem Information and see that Mac does not recognize that the graphics card has 4gb, 2gb only indicates. I go to Nvidia Driver Manager and ECC section provides "ECC not suported"... and says that no updates are available. I don't know can do to solve these problems ... please help!