PSU query

  Madscot_uk 20:03 26 Mar 2006

Just out of interest i was reading up on psu units, as out of all the components of a pc is the one i know least about. Looking click here shows a table (second one for atx psu units) on how to calculate psu wattage using volts * amps for each rail.

My psu is labeled 350W with the following rail specs
+5 30A
+12 20A
+3.3 14A
-12 0.8A
-5 0.5A
+5 vsb 3A

Going by the calulation in the link this gives
240 + 150 +2.5 +9.6 +15 = 417W

Which one is most likely to be the more accurate reasoning, or is it a case of psu rated at 350W but can cope with 417W? Or have i made an error in calculation.

Thoughts appreciated

  DieSse 20:05 26 Mar 2006

Each individual figure is a maximum for that voltage, but all cannot draw the maximum at the same time - that's all it means.

  Totally-braindead 20:11 26 Mar 2006

Also would like to point out that if this is not a good quality branded power supply and is the one supplied with a typical PC then it will probably struggle to supply even the 350 watts you say it is rated at.

All power supplies are not equal. Branded ones are far superior.

  woodchip 20:25 26 Mar 2006

You are calculating the Max output. Not running under load

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