December 1st, 2010, 03:43 AM
Power Supply + Watts Ratings
This is a 2-part question. Firstly, if I want to work out the proper wattage rating on a PSU, is this the correct formula:
Amps x Volts = Watts?
The PSU I want to check lists the following:
If the formula of A x V = W is correct, then I calculate that the rating on the PSU should be 460W.
3.3 x 18 = 59.4
5 x 30 = 150
12 x 19 = 228
5 x 0.5 = 2.5
12 x 0.8 = 9.6
5 x 2 = 10
Secondly, is there a tool available, either hardware or software, that can measure the total Watt loading of a system while it's running? Further, is there a website that gives a good guide to the approximate Watt ratings of major internal components - a Wattage Calculator, if you like?
December 1st, 2010, 18:32 PM
Hardware - Kill A Watt
Software - Speedfan
December 2nd, 2010, 19:18 PM
Thanks for those links. Are my calculations for the wattage on the PSU correct? Also, is there a website where one can figure out the wattage of components prior to a system build?
December 3rd, 2010, 20:56 PM
The manufacturers website should have links to the specs.
Originally Posted by Island_Boy_77
June 10th, 2011, 10:06 AM
Unsure if you've continued your research NZ, but i think you are correct for the power formula and the practice of PSU to sum up all their rails. This makes the need to carefully double check AMPS! 500W from one company is not the same as 500W from a better company
Finally, yeah, check with your hardware supplier for Max Wattage... i.e. Quads usually run ~100W, Video can use ~500W!!! HDD et al ~100W ... hence the need for min 500-650W these days....
I use a device that plugs inline with my pc and wall, it gives real time WATT usage. Mine uses 100W idling and upto 400W on full load etc.
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