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-   -   Multiple Power supply Guide (https://www.overclock.net/forum/31-power-supplies/14455-multiple-power-supply-guide.html)

SpookedJunglist 02-25-2005 01:38 AM

How to use two Power supplies on one computer.
Difficulty rating Moderate

Ok let me start off by stating that many of us have old power supplies laying around our house. This guide will give you step by step directions to use that spare power supply unit [PSU]. Why would you want to have two PSUs anyways? There are many reasons to have multiple PSUs for your computer. One reason is to take the load off of the PSU that supplies power to your Proceesor, thus allowing for better stability for overclocking. Another reason is so that you can power up other 12volt items without your computer examples being Peltiers, Cold cathode lightuing, external fans, and so on. One more reason is that if you have a generic PSU and need power for your new high end graphics card, you can dedicate a spare PSU to run only that item. Over all there are many reasons to have some extra power on tap, I am just going to help you get that power really cheap .

1 Spare Power Supply
2 Male pins [ need to fit the 20pin PSU molex]
1 piece of 16 guage wire 2-3 inches [5-8cm]

Optional supplies
1 Single Pole Single Throw switch(SPST) "Push On-Push Off"
1 4pin fan or light "for testing purposes"

Tools Needed
Wire cutters [needle nose pliers work as well]
Wire crimpers [needle nose pliers work as well]
Pin insertion tool [needle nose pliers work as well]
(If you couldnt tell all i used was Needle nose Pliers)

Ok now on to the Fun part, Modding the PSU

Step: 1 Cutting the wire

Ok now take your little piece of wire and strip the ends off.
Your wire should look like mine in the picture below.

Step: 2 Making your Jumper

Take your Male pins and with your needle nose pliers crimp them onto the wires on both ends so that you can just bend it around so that the pins can touch each other.

Step: 3 Jumping the PSU

Here is the tricky part, We need to find the Pins that the Motherboard uses to turn on the PSU. On most PSUs the wire that turns it on is Green wich needs to connect with a ground Black. I have created a image that shows what all the different wires do on the 20 pin connector, and have pointed out the Power on [PS_ON#]and the closest ground [COM]. We will use our jumper to connect them together.
Below is the image showing where the pins are located, the clip is on the right in my picture.

STEP: 4 Connect the dots

Ok so all you have to do is this, with the clip to your right count 4 pins up and place your jumper in the 4th hole on the right side. Refer to image above for pin locations.

Then go ahead and take the other end of the wire and conect it to the fifth hole, Right above the one you just inserted, it should look like the image below. Refer to image above for Pin locations.

Thats it now plug in your fan and turn it on to make sure it works.

Alternative Steps
Installing a on off switch to turn on your PSU.

From step 2 instead of creating a jumper do the following. Take a Single Pole Single throw(SPST) "Push on Push Off" switch, And install wires to the switches posts. And on the ends of the two wires install the Pins. Then follow step 4 above to insert your switch into your PSU. Should look something like the image below.

Now that that is done you can mount your switch anywhere you would like it to be on your case.

If you are having trouble with any of these steps please PM me and i will be happy to help you..

If anyone has any suggestions for this guide please let me know and i will try to add it as soon as possible.


tw33k2514 02-25-2005 01:51 AM

Awesome guide helped me 100% but one question were do i get a male pin lol

GateCrasher_VI 02-25-2005 01:54 AM


tw33k2514 02-25-2005 01:56 AM

Originally Posted by GateCrasher_VI
thanks becuz right now im powering my vid card with a 450 psu with a paperclip and im not sure i trust a paper clip lol

GateCrasher_VI 02-25-2005 01:57 AM

lmao, please tell me you have a fire extinguisher handy......OH FOR THE LOVE OF GOD PRETTY PLEASE!!

*sigh* see, this is why modders don't live to ripe old ages children

tw33k2514 02-25-2005 01:58 AM

lol well the paperclip is holding up fine its just scary lol

SpookedJunglist 02-25-2005 02:00 AM

i have used a staple for well over a year back in the day

tt_shark 02-25-2005 02:00 AM

LEGEND!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Im repping you dude, a saviour to all

SpookedJunglist 02-25-2005 02:01 AM

No problem, thanks for the reppage

to be honest this was the eisiest of all the things ive been working on, i just never got around to finishing it, and since there was a need i decided to complete it now

tw33k2514 02-25-2005 02:08 AM

heres a good question does it work the same for 24 pin PSU's?

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