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On 17/09/2015 15:26, james wrote: |
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>> With that GPU, you don't need more than 400W. And the amps on the 12V |
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>> > rail are also not important, as that only comes into play with |
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>> > higher-end GPUs. Other features can still be important though, like |
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>> > protection against surges and such (think lightning strikes that can |
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>> > potentially damage your PC, or some PSU malfunction that could do the same.) |
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> |
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> True, but you are not considering transient voltage swings. If your rig |
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> draws 350 W and you have a 400 W PS, you will get spikes and draw-downs |
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> on the voltage during transient period of peak usage. This will kill a PS |
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> over time, faster that if the 350W rig is running off a 500W supply. |
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> Lots of quality capacitors in the PS minimize these effects. If the PS |
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> is rated as extremely efficient (compared to other PS) then it has |
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> better quality components inside the PS (they react faster to transients). |
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I have yet to see a computer that draws 350W sustained :-) |
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Spikes of brief duration yes, sustained no.[1] |
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But now I'm being pedantic right after you tried so hard not to be. |
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[1] Anyone who wants to know just how much power 350W really is, |
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consider that your electric kettle is about 1000W and can boil 1.7l of |
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cold water in 2 minutes. I know [CG]PUs get hot, but they don't get |
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*that* hot. |
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-- |
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Alan McKinnon |
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alan.mckinnon@×××××.com |
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