Can I make a 12v SB line from the existing lines on this ATX power supply? I'm told that +/- 10% voltage is acceptable. Can I combine a (red + orange + purple) 5V + 3.3V + 5VSB = 13.3VSB?

I'm working on a Dell C8220 board with proprietary 18-pin, 8x +12V & 1x +12VSB & 9x Ground.

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  • \$\begingroup\$ removed the unrelated tags. Neither step-up power supplies nor color coding are subject of the question, even if the cables have all the nice colors :) \$\endgroup\$ – Marcus Müller Mar 18 '20 at 19:25

No, you can't; that's not how power supplies work.

The "negative" part in all your voltage rails is the same voltage, actually even connected, so you can't connect them in series.

For that to work, these individual voltage supplies would need to be isolated from each other. The opposite is desirable within a PC: you want all voltages to be relative to the same chassis ground voltage.

  • \$\begingroup\$ I don't know how the negative part factors into my question. \$\endgroup\$ – tidelake Mar 19 '20 at 11:12
  • \$\begingroup\$ you wanted to connect your voltage rails in series, so that voltages add up. That wouldn't work, unless the negative conductors were all isolated from each other. \$\endgroup\$ – Marcus Müller Mar 19 '20 at 11:42
  • \$\begingroup\$ Can I add components to make a 12vSB? Could you recommend action here? The board takes a 220v "switching" power supply. I'm curious about using my 120v psu as it puts out more than enough for the 200W to the server board. Thank you. \$\endgroup\$ – tidelake Mar 21 '20 at 8:57
  • \$\begingroup\$ no, you realistically can't. \$\endgroup\$ – Marcus Müller Mar 21 '20 at 9:02

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