how to determine PSU wattage

[E.S. Rosenberg]

2013/8/1 Oleg Goldshmidt <pub at goldshmidt.org>:
> shimi <linux-il at shimi.net> writes:
>
>> If you're looking for an equivalent PSU you must buy the exact same
>> model - not same wattage...
>
> No, I wanted to plug in another PCIe card and I wanted to estimate
> roughly which models my existing PSU could handle. I just fired up one
> of those "minimal power requirements" calculators on the Web. I am
> guessing that a rough estimate (is it a 400W, 600W, 800W PSU?) should be
> OK for the purpose.
When dealing with additional cards you have to look at the power the
individual rails provide, because if you don't have enough power
available on your 12V rail then no matter how high your PSU is rated
you won't have enough power....

>
> --
> Oleg Goldshmidt | pub at goldshmidt.org
>
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