Trixx can overclock a trinity system. However, it lags until you change it for the 7670M. If you have the patient, let it load fully, click over the tab that selects for the grapic card,waiiiiittt, select 7670M, waaiiiiiiit. Tada, you are good.
Now you can clock the Core all the way up to 900Mhz... I know that 780 is stable.
Alternatively, I also got msi afterburner to work. You have to first disable ULPS.
reboot
Go to the MSI After burner short cut. add /xcl after the quotation mark.
Open the program (Nothing will happan).
Restart the computer.
Go back to the short cut, remove /xcl
Open the program. it should like you adjust core and memory
I'm on 12.8 catalyst.
Pushing it to 780 Mhz gives a nice 20% increase without much increase in temperature. The 7670M is pretty OCable.