2 (or more) Common Slot PSU's in parallel?

[stephenm]

Hi guys,

I have 2x 1200W common slot PSU that I want to use on the same mining gear.

I have similar things in the past back in the early days of overclocking over 15 years ago and back then there were some things to do to get this running correctly.


Specifically:
* Do I need to connect the grounds from each PSU together? or is that done automatically through the hardware (MB, GPU's, etc.)
* Same question for the 12V, should I connect the GND and 12V lines together through a couple of 6 pins connectors. What happens if I do?

The goal of connecting 12V and GND would be to streamline what goes where, so that I don't have to really pay attention too much about how many GPU's should I connect to each PSU's. Maybe I am overthinking it, but I know some current is going through the PCI-E riser boards, and some through the 6-pin Power connect on the GPU itself. But what's the balance? that's highly dependent on the cards themselves.

from my point of view connecting 2 PSU together (linking 12's and GND's lines) would be ideal - though the question of much current will be going through the "bridge cable". If that's too risky (through cable), why don't manufacturers of PDB/Breakout boards don't do DUAL boards with all the linking done through the PCB where it's a lot easier to get through high current?

thanks

[mcs_john]

Hi,

There are motherboards for 2 PSU's, even 3, like https://www.asus.com/Motherboards/B250-MINING-EXPERT/
Otherwise I would recommend a dual psu adapter, like http://www.thermaltake.com/Power_Supply/Accessories_/PSU_Cable/C_00002406/Dual_PSU_24Pin_Adapter_Cable/design.htm.
I hope this answers your quesionss.

[stephenm]

Sorry for the misunderstanding, this is the PSU I am referring to:

https://www.parallelminer.com/product/hp-1200watt-high-efficiency-platinum-hot-plug-power-supply-dps-1200fb-1-a/

[RDMPlaysGames]

https://www.amazon.com/gp/product/B072JM7KVD/ all you need. I ordered and used one. Here is a video showing you how.: https://www.youtube.com/watch?v=PPUQjWDSddE

[fanatic26]

While you can do what you are asking, I wouldnt recommend it. Just try not to be lazy and pay attention to how you wire things.

If you run them in parallel and one of the PSUs shuts down its going to screw up the whole rig, all you are doing is adding failure points. Is all that extra work really worth not just looking at which PSU is powering which device?

[stephenm]

While you can do what you are asking, I wouldnt recommend it. Just try not to be lazy and pay attention to how you wire things.

If you run them in parallel and one of the PSUs shuts down its going to screw up the whole rig, all you are doing is adding failure points. Is all that extra work really worth not just looking at which PSU is powering which device?

thanks - but isn't that the purpose of fault protection X11 boards?

https://www.parallelminer.com/product/x11-breakout-board-adapter/
https://www.parallelminer.com/product/x11-breakout-board-fault-protection-cable-kit/

[fanatic26]

Yea I mean that would work. Man those breakout boards are expensive tho, I pay about $8 each for mine. That and Id rather have one PSU die and the machine keep mining on the rest of the cards until I can get to it rather than losing the whole thing.