We also pay electricity using those those things!
My power cost isn't an issue!
Most lots radeon gpu use scrypt and produce a fair bit!
Although, I not speaking miner software, the ones supporting GPU are
1) sgminer5-1
2) cgminer3-7.2
Sgminer5-1 is by preferred one as we can mine 3 kinds of coins at a time and cgminer doesn't!
In fact I am mining on radeon r7 I believe and still produce more than CPU using preferred miner.
Getting radeon R9 would be better!
You need Scrypt-based ASIC units to mine with, not a montherboard and/or GPUs, unless your electric is FREE or you like giving your power company money for very little return.