I have a couple of rigs running on ubuntu with 6x R7 370 each. No problems at all with those.
Last few days I been trying to build another rig with HD7970 and R9 280 but those older cards are only hashing 0.2 and 0.4 sol.
I am confused if I need to add the tahiti.bin file somewhere?

Same as per the R7 370, I run ubuntu server 12.04 with fglrx 15.302 drivers. Tried to put the SDK but no changes at all.

I thought I would get more out, anyone knows? Lolliedieb any advice?