ya, i swapped psu and it fixed it. i took the pc to a computer repair shop when i first put it together just to get everything tested and make sure everything was working. they told me they tested psu. so i took their word for it. one of the mobo's was def bad cause when i first hooked it up i swapped psu's trying to eliminate the problem and it wouldn't boot. second mobo had a small scratch on it when i got it (it took out tracers on board), 3rd mobo works fine. kinda pissed at that computer repair shop tho. cause i would have sent psu back much sooner. damn thing is a corsair 1000watt platinuim certified. and it came doa.
... so you are heating with 40-60% your room - which is quite nice in the winter
"The efficiency of a computer power supply is its output power divided by its input power; the remaining input power is converted into heat. .... Supplies are typically most efficient at between half and three quarters load, much less efficient at low load, and somewhat less efficient at maximum load."
maybe you can test a another PSU and use just 2x RAM