Hello, by following thread on this site, I got Yosemite installed on my old 2006 iMac 6,1. but I just can't get 7600GT to work on it. I tried OSX helper kext, copied old lion nvidia kext, edited IOPCIfamily by adding deviceID but no luck. I am able to boot and log in but as you know graphic is super choppy as the system reads graphic card as 7600GT 9MB. Any idea how I can get Yosemite to recognize 7600GT? Thanks in advance.