Crossfire isn't popping up in Catalyst Control Center! Help!

[KillerDustles]

I just upgraded my power supply to be able to crossfire and I launched the computer and uninstalled all the drivers and installed the newest ones for my Radeaon HD 7790, Powered it down Installed my HD Redeaon 7770 in (Which are on the same driver) I Powered it down once more and installed the Crossfire strip on the top of the two cards then relaunched it and I used the program GPU-Z, It told me it dectects both cards but then I when into AMD Catalyst Control Center and it didn't give me the option to enable the crossfire. What should i do?

 

[popatim]

Check to see if your motherbd supports xfire

 

[KillerDustles]

Motherboard allows it. In fact it says it right on it.

 

[popatim]

Systems specs plz

 

[Supernova1138]

You can't Crossfire the 7790 with the 7770, despite being in the same series. The 7790 was released almost a year after the 7770 and is based on a slightly different GPU architecture, so it won't work. The 7790 can only be run in Crossfire with another 7790 or an R7 260 or R7 260x, which are basically rebrands of the 7790 .