3 diffrent psu calculators, 3 different answers

[reconviperone1]

I used the newegg,extreme psu, and psu watts and 12 v calculator, for a system based on a q6600,gtx 260,2 dvd-rw,3 hard drives,a regular desktop mobo, 5 usb devices, 4 fans, 2, pc1, and 1 pce-1, i receivedd the following results, newegg pus cal-663 watts,extreme psu-387 watts, psu watts and 12 v calculator- 413 watts. Any clue as to which of these is more accurate?

 

[delluser1]

The Newegg calculator is based on the Extreme psu calculator, why the 2 numbers would be so different is beyond me.
Whats the 12v calculator that you speak of ?

 

[reconviperone1]

The Newegg calculator is based on the Extreme psu calculator, why the 2 numbers would be so different is beyond me.
Whats the 12v calculator that you speak of ?

http://web.aanet.com.au/~SnooP/psucalc.php

 

[Shadow703793]

The system you mentioned will actually use only about 387W at the outlet. Newegg is recommending that you get a decent 650+W PSU. Any good 550W (ie 550VX,etc) PSU can power that build fine

@OP: Use this calc: http://extreme.outervision.com/psucalculatorlite.jsp
I ran smiler numbers to your system, with a OCed Q6600 @3.4Ghz, and I got 395W. This is the MINIMUM wattage you will need.

 

[delluser1]

http://web.aanet.com.au/~SnooP/psucalc.php

This is my favorite as it give's an idea of actual use, not a wattage reccomendation.
Using crude math and a Killawatt meter, the aanet calculator is close, and is within 3% of the readings that my Odin Gt throws out.