running two power supplies

[Xxspd88xX]

hey guys, i was just wondering how to run two power supplies at once. i know that it is possible for them to run together for one computer, but i just dont know how to.

i plan on using my spare 300w psu along with my current psu so i have more juice for my computer.

if anyone knows how to short circuit the power supply so that it doesnt need the motherboard to tell it to turn on, itd be greatly appreciated.

on a side note, i found a site by using google, but i didnt really understand nor have any of the equipments required to run the psu. thanx again.

 

[Waylay00]

I used to do this all the time, and I'm pretty sure you jumper the green and black wires toegther by using a paper clip or similar device. Then simply flip the onn/pff switch to the on position right as you turn on the rig. However, I would only connect devices such as fans, water cooling devices, temperature readers, etc to the extra PSU. You may run into some problems if you turn on your computer, and THEN turn on the extra PSU if it had a critical device (ie - a hard drive) hooked up to it.

 

[fire400]

two power cords? or one power cord?

do you want to cross breed the wires? or run them separately?

what are you trying to power again?

how much efficiency do you want on one PSU versus the other PSU?

 

[KingofFah]

Waylay00 is correct: The green wire and any black wire (GND) connected with a paperclip or some wire will make it so it turns on as soon as you flip the switch.

There are also ways of doing a Y-type 2 to 1 24 pin connector to the motherboard, but I don't know about the output's capability to handle the extra amperage of two PSU's (one of the reason's they started using more than one 12v rail).

I did this with an old sparkle psu for my dvd duplicator controller and drives.

 

[alimoalem]

i'm subscribing to this. i always wanted to know why those people that get the 700w+ PSU's can't just get 2 450w fortrons or something

 

[KingofFah]

Exactly, if I didn't care about how the inside of the case looked, I would pay for just 2 FSP's. However, I'll be going with two NUUO's in a Stacker STC-T01. 80$ stable dual 12v rails 550W PSU's -- you can't beat the NUUO's.

 

[Bassyhead]

Connect the green wire on the second power supply to the green wire on the supply connected to the motherboard. The second supply will run whenever the first runs. I don't think it would be a good idea to connect the power from both supplies together for technical reasons, including that most of the power would be drawn from whichever supply that has a higher voltage on a given rail, even if it's just a little bit.

 

[fliguy84]

this pic might help (from Guru3D)

Text

 

[Juno]

nice, i'm gonna try it out!