Two Power Supplies For One Computer

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zakringaming

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Nov 11, 2017
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I am upgrading my computers GPU, however my power supply only has two empty six-pin connectors. Upgrading my power supply is not an option, it is a 825 Watt, the reason it only has two six-pin connectors is because it is running a dual processor build. I have some extra 600 Watt power supplies that I can use. My question is what exactly needs to be done in order to get two power supplies to work together on the same computer.

I am already aware that only one PSU should be used for the mother board, and the other(s) should only be used for the GPUs. I have been reading some other threads, and people have recommend adapters and things, but are they really needed or can I just run them as-is. I am asking before I try, because I don't want to burn out anything. Thanks for any help.
 
Solution
B
What is the PSU?
Any real 825w PSU should have more than 2 6 pin connectors.
So either
1) it is a modular and you just need more cables,
2) it is a quality older one that just didnt have more than 2 6 pins, in which case an adapter is safe
3) (most likely one of the 3) it is a cheapo garbage PSU that sold you by putting a high number on the box and that 825w is literally nothing more than ink printed on a sticker. In reality this unit cant even handle 500w let alone 825w which is why they only gave you 2 GPU connectors. If this is the case then using this PSU with or without your new GPU is huge risk to all of the parts of your computer because when these time bombs die, they fry most anything connected to it. Not only that but...
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sizzling

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Oct 18, 2006
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Very risky if you get anything wrong, I know it can be done but I also know its not straight forward. The PSU's have to share a common ground and power switch jumper. Then you have a mess of cables to deal with and where to put the 2nd psu so it doesnt interfere with anything else. Just get a psu with the required connectors.
 
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boosted1g

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Jun 12, 2013
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What is the PSU?
Any real 825w PSU should have more than 2 6 pin connectors.
So either
1) it is a modular and you just need more cables,
2) it is a quality older one that just didnt have more than 2 6 pins, in which case an adapter is safe
3) (most likely one of the 3) it is a cheapo garbage PSU that sold you by putting a high number on the box and that 825w is literally nothing more than ink printed on a sticker. In reality this unit cant even handle 500w let alone 825w which is why they only gave you 2 GPU connectors. If this is the case then using this PSU with or without your new GPU is huge risk to all of the parts of your computer because when these time bombs die, they fry most anything connected to it. Not only that but there have been many cases of them starting house fires.


Using 2 PSUs in one system is never a good idea.
Sure you can solder the trigger wires together to tackle that problem but the other issues make it too risky.
For one with 2 PSUs you have 2 different ground points and that can cause unstable conditions or even risk damaging your PC.
For two in most all cases that people do this it is to try to overcompensate for an inferior primary power supply which is just asking for problems for the reasons stated earlier.
 
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