2 PSUs?

Jokester

Jokester

Jokester

Don
Joined
7 Aug 2003
Posts
44,675
Location
Aberdeenshire
Is there anything I can buy that will let me start 2 PSUs at the same time from the motherboard power switch?

I'm guessing I could mod it so that the second PSU has it's green and a black pin connected to the same on the PSU powering the motherboard but I would rather not have to if there is something available to do it for me.

Jokester
 
I've got the cable from a Coolermaster Stacker in the loft, I believe that does exactly what you want, drop me an email and I'll dig it out for you :)

It looks like this:

DSC01149.jpg
 
Clear! <bzzzz>

No that this thread has succesfully been brought back to life, is it at all important to separately connect the ground wires of the two psu's? In the guide I've seen using the relay method it doesn't specifically say you have to do this. But say you have one psu powering your mobo and cards, and another powering your fans and drives, the fans will be alright because they are totally isolated from the other power supply, but the drives will be connected to the main psu via the ground wire in the data cable which is obviously a tiny wire. I'm not an expert but won't this set up a ground loop if the 0V lines are slightly different, which they will be, which will ultimately conducted through the mobo? So would having a direct connection of the psu ground wires as they come out of the psu be better?
 
The Stacker cable connects the ground in both PSUs together. I had the same concern in the case where you weren't directly grounding them for the reasons you've given. You would need to run a wire between a black core on each PSU to ground them together, you could do this between two molexes. Either way I've never had a problem where I've run two seperate PSUs without doing it so I don't think it's a real problem in reality.

Jokester
 
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