Why not use 7950's for lite coin mining?
4 7950's would hash around 2000 kh/s 4 7970's will hash around 3000 kh/s.
But for the price of 4 7970's you can get 6 7950's. So your point is not valid.
7950 is more hash per dollar. And also wattage.
Meh. To each his own. I don't like sticking 6 cards on a single MOBO, it doesn't fit in our rig.