This video card is very weak for mining. Take at least R9 390 8Gb. And this vidyuhi only kill your hardware
The R9 390 8GB is overpriced in my opinion. I think it holds a premium because its the only Hawaii type of GPU that features 8GB of ram but you got better alternatives out there, especially when it comes down to mining.
You can get an RX 470 4GB/8GB for way cheaper and it will yield much more profit and much less power consumption.
The 390 8GB I think is better than the RX 470 8GB in gaming but not mining.