What are the specs and power consumption levels of that setup?
Not good

But I have cheap power so efficiency hasn't been my number one concern.
All the cards plus the bitForce single on the left get me about 8GH/s. Electrical usage is about 3,680 watts and costs me .0479 USD.
Some things I want to do to trim my power is flash and downclock the memory of my 4 6970s and also downclock/volt/whatever the CPUs. Not sure how much that will really save me though.