To run TWO of them off of the same PSU? That sounds too low to me. A pair of motherboards with integrated graphics and E6300's running the F@H SMP Client off of a single PSU draws 240 watts from the wall as measured by a Kill-A-Watt meter. I can't imagine a pair of motherboards with i7 2600k's only using the same amount of power. I could be wrong though.
Phaedrus2129: Thanks for the info. I don't know if I will actually do it--it was just a thought. It might be worth trying and seeing what happens, if I can find a 24pin Y cable.