hey all, running Yosemite on my 1,1. I have a Zotec GTX 750 TI. I've been able to run a GeForce 210 with no issues, if I stick the 750 in slot one, I don't get video, it doesn't even appear in the pciexpress config tool. If I run the stock x1900 in slot two, and the 750 in slot 1, and set the configuration to make slot 1 8x, I can see it. Any suggestions on getting the 750 to run at 16x? If I run the 750 at 8x will I care?