12.7 beta should come with 12.7 CAP 1
I'm 99.9% certain that you always have to install the CAP profiles separate from the actual driver.
@OP - Did you install the 12.6 or 12.7 CAP profiles?
Also, your 3dmark11 score looks fine. And your CPU is good and shouldn't be bottlenecking anything. You're (with 99% certainty) looking at some sort of driver problem.