I'm sorry for that. I just found the link for the guide via google.
So there is no way to port the method to the latest driver?
I pretty much wrote the steps for this a long time ago. This website is just adding pictures to my steps.
Also, this guide is invalid for any of the new R7/R9 GPUs (or radeon 7790), as they will not be supported with the 12.6 driver, which enables 6 GPU in win8.