6970 BLOWIN UP THOSE 2 7970s WUT??

Is this the cards or the miner not being efficient?
That is not just Miner Issue,
JHA has designed to get the higher result for the higher performance in compute unit,
AMD has changed their stream processor from VLIW to SIMD, it means, reduce the computing power but, increase data processing power.
It is the best way to integrate more data processing unit which needed to support the graphics (3D and 2D).
VLIW has higher performance at Calucation
SIMD has higher performance at Data Processing
The other algorithms are depend on the data proessing power instead of computing power,
It is why AMD processor has much higher performance than nVIDIA or CPU,
it is why 5xxx/6xxxx or nVIDID or CPU has much higher(relatively) performance in JHA,
AND, One more critical factor is the OpenCL compiler from AMD, it is really really sucks,
I have tried to optimize OpenCL kernel for GCN processor,
This compiler is compling very strangely, some time going well, some time it generate too much gabages.