I didn't see a advertised 8x/8x multi gpu outline. But yea I agree with you with the 7970 working in CF on a 8150 would probably take quite a bit of overclocking to get there.
I would also suggest that you only upgrade a card if you can make use of it. A 7970 on its own is enough on a single monitor solution beyond that is overkill even with a 120 hz monitor that hz a higher refresh rate.
Right okay yea I was going to do that just didn't want to download the PDF. I wish that these companies the gigabytes, the msi's would just do what ASROCK, and ASUS do they label the speed of the SLI/CF configurations on the spec sheet doesn't seem to hard to do.