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Dual PSU project

V

Voodooo

Limp Gawd
Joined
Oct 4, 2000
Messages
429
I currently use a Thermaltake 480W psu. It is running very hot during load because i connected the internal fan on 5V stead of 12, otherwise its very noisy.

I have this 360W Chieftec psu aroudn here, I was thinking to use it to power all the fans, the hard and the cd. Cool it with just one 5V fan, wont get hot because of the small load, and it will take some of the load from the Tt and make it run cooler.

The question I cant answer is, could I use the second motherboard connector (12V one) from the second PSU ? I think just a few fans and a hard wont make much of a difference, but that 12V connector would...
 
Why don't you just get a quiet fan for your 480W psu? That would be such a waste to have that psu for just powering a motherboard. You can certainly do two power supplies, though. Just wire the green wires together so that they turn on together.
 
I really am a silence freak :) And having two PSUs would be a cool mod :p Here is what i had in mind, altough i have a certain fear regarding the dual motherboard feed.



dualpsu.jpg
 
There's no need for using the 2nd motherboard connection. You can use the 2nd PS without connecting it to the motherboard.

Just hook up your fans and whatever, then, on the 20 pin ATX connector of the PS, put on a jumper between pin 14 (green wire) and pin 13 (black wire). This acts as having hit the power-on button on the front of the computer, but bypasses the switch and motherboard. While the jumper is on pins 14 and 13, everything that is plugged in should start up, and when the jumper is removed, they shut off.
 
No that really is a horrible idea. When you have two standard psus in one computer, you need to keep them isolated. If you hook the lines together and the voltages aren't exactly the same, then they power supplies will fight each other and try to make the voltages equal. This is bad for the power supplies, and it would be really bad if they were battling through your motherboard. Just have one power supply go to your motherboard and have the other one power everything else. I had two power supplies in my old computer. I was cheap. It was cool, though.
 
I was thinking that just the fans and a hard drive do not really justify the second PSU. I suppose the 12V connector is for those nasty mosfets in the power circuitry of the motherboard. I wonder what is the Watts count in there..
 
jpmkm, thanks. Thats exactly why i had doubts and asked first, two sources into one component sounds fishy.
 
Since you already modified your PSU, why not add a better fan or use a resistor to get a voltage somewhere in between 5 and 12 V?
 
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