Hi guys, Im new on forums but long read your posts. I hawe problem and cant find solution My question is how run Zotac GeForce 560Ti 1gb on MacPro 1.1 (not firmware yet on 2.1) and OS 10.9.3 (with Tiamo) ?? Last sunday Im trying all day to do but nothing, Im puting some kext find on net (for Lion) only kernel panics after 15 sec. start loading boot screen with apple logo. With Pacifist Im install latest Nvidia drivers an Im success load Mavericks but not recognize 560ti (in slot 1 was old 7300 for boot screen) After I close down and put back PC Radeon HD 6670 (work fine from 10.6.x) only black screen Now dont work card who works . Yesterday i Load backup and start again. Now Im find Modded_WebDriver-334.01.01f01 and Install Ok. Now I hawe in system manager Nvidia Driver Manager Preferences. When install drivers I hope that everything with 560Ti be OK but nothing only black screen, and when put 7300 can see boot screen again kernel panics, sorry first time was freeze after 20 sec after apple logo. I try put off 2 x 6 pin power cable and load OK but cant see 560Ti in slot2. I suspicion on extra 6 pin power (6 pin cable are OK) . or something in kext for graphic card power . Thank you for all the help!!