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Did you try this method? Read posts starting here for about 5 posts thereafter: http://www.tonymacx86.com/yosemite-desktop-support/143978-almost-everything-working-but-usb-3-0-any-suggestions-3.html#post890563

Don't forget the 's' in GraphicsEnabler=Yes.

Just search for AppleUSBXHCI v705.4.4, you'll find it.

Here's the steps I did to make it easy. Copy the IOUSBFamily.kext from /System/Library/Extensions to your desktop. Don't move it, copy it. Then rename it to IOUSBFamily.kext.bak. When you rename it, then it shows up as a folder and you can click to Contents and then Plugins folders. Copy...

I got my USB 3 working finally. Deleted GenericUSBXHCI.kext and copied the AppleUSBXHCI.kext from 'another site' into the plugins folder of the vanilla IOUSBFamily.kext. I believe the ASUS P8Z68 Deluxe uses the Asmedia USB 3 chipset, but not sure. -cp

USB 3 not working here also. P8Z68 MB here and also the usb 3 drivers on latest MultiBeast, and other areas around the web are not working. Getting duplicate ID or something like that when it loads at startup. -cp