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Connecting 2 ATX PSU's together 2:  Theory


The Master PSU is the one which must be connected to the motherboard and I would recommend one that has a high wattage 3.3/5V rail because some CPUs, in particular the Athlon, require this high wattage.  It may also supply 12V to supplement the 12V supplied by the slave PSU if required.  You can check some of these out at AMD.  The Slave PSU, which mainly feeds the 12V required by harddrives, CDROMs etc, can be any PSU with a decent 12V rail, even your existing one.

The colours of the cable may differ so make sure you use the pin numbers, (see page one for pin numbers Pins 15 and 7 (Black) are ground wires, pin 14 (green) is the power on cable and pin 8 (grey) is the power good cable.

Connect pin 15 from both PSU's together and connect pin 14 from both together.  On the slave PSU  connect pins 7 and 8 together.

Disclaimer: This article is for educational use only!  Under no circumstances do Burningissues.net or I accept any responsibility for the way you use this information.  This project should only be carried out by competent persons.  After saying that, to the best of my knowledge, as long as you follow the instructions carefully you should have no problems.  I would recommend testing it on an old motherboard if possible.

Page 1: Introduction

  Page 3: Making the adaptor

 Page 4: complete

Page 5: Hints and tips

 

Copyright Graham October 2000 for Burning Issues - all rights reserved

 

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