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
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
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