[quotemsg=19479543,0,202972][quotemsg=19479497,0,1748327]10TACLE, if the efficiency of the EVGA and the Corsair are nearly identical, the ~5 degree C temp difference could be just from the amount of airflow being less in the Corsair. Power consumption is the only thing that equates to BTUs, heat.[/quotemsg]
That's why I stated the downside to the Corsair is the hotter air coming out the back. Same thing with a video card: you have to sacrifice more heat output for a quieter fan speed.
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His point is that without considering air flow rate, exhaust temp does not tell you much heat it's putting out. If you want to know how much heat the PSU is dumping into the room, divide system power draw by efficiency. Even if you're running those PSUs at 1000 W (and we assume for the moment that the average efficiency you calculated applies with a 1000W load), you'd only be looking at 9 W difference in heat output, which is pretty trivial. That's not going to make a difference to the temperature of your room.
Regarding your video card example: slower fan speed results in a hotter GPU, but it doesn't change the amount of heat output.