Kill-A-Watt question

[Vorg]

Question now that I know how many watts my system draws AC wise (345 at load) and let say my PC P&C 750 is 80% efficient.

How many Watts then is my system pulling DC on a 12v side?

Can I assume then that my system is only pulling 500 - 600 watts from the 750 power supply? which is more then the 50% to 60% that some article (forget where I read that) recommends so that it doesn't tax your power supply and make the fan spin in high gear?

If that is the case then maybe I do want a 1KW power supply if my system is indeed pulling 500 watts.

Right now at idle Kill-A-Watt is showing 295 watts being pulled on the AC side and the fan on the power supply is barely turning. but once the system starts drawing 345 watts then the fan is turning it heart out.

Then the question is, while a 750 power supply is able to handle my system and probably a whole lot more that what I have. but it does so at the expense of being noisy but I have only spent $200 on a power supply. Is it worth it to spend $500 on a 1KW power supply just to be quiet while gaming?

for me if I had know what I know now I would have just dished out the extra $300 just for a quiet system. but now that I have the 750 (which I guess I could put it on ebay) I'm having to think twice.

 

[[Spectre]]

If you are pulling 345 watts AC and your PSU is 80% efficient then your DC draw is 345*.80=276w. How much of that is 12v is a little harder to figure because you also have 5v adn 3.3v outputs. But your 12v draw isn't more than 276w/12v=23A.