I'm migrating from a Hackintosh to a 2009 Mac Pro. I have diligently searched here and cannot find and answer to my question, so please do not flame me. If it has been answered many times I'm afraid I cannot find the answer. The GTX660 card I want to install in my Mac Pro 2009 (2 x 2.26, Mac Pro 4,1, 8-core, 10.8.4) requires a six pin power supply. I have diligently searched on the backboard/motherboard in my Mac Pro, even removing the processors, processor cage and the case fan, and cannot find any available source for a cable to the 6 pin socket on the GTX660 card. Can someone point me to the specific location of the power source from which I can run such a cable? If I need to use a splitter with an existing connector, could you please indicate specifically which connector I should reroute via the splitter? Videos of the 2008 I have watched show the source to be under the case fan, but the 2009 has no such source in that location. I even removed the case fan to check. Thank you in advance.