Running 3 r9 280x cards with one 7970

[chesthing]

I tried to add a 7970 ghz edition card I took from my 7950 rig to my 3 280x card rig and couldn't get any video out of it nor did cgminer recognize it. Do I need to run the drivers for the 79xx series? if I do that will it mess up/conflict with the drivers I have already run for my 280x cards? Sorry if this is a dumb question, new at this.

[chesthing]

I checked the AMD site and the drivers are the same for the 79xx series and r9 2xx series, anyone know why I can't get cgminer to recognize my 7970 when I replace one of the 280x cards with it?