dual power supplies

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Orddie

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im about to ask what im sure is the stupid question of the day....

most guides call for two power supplies the more cards you have and use a paperclip to do so.

what happens if you leave the GPU power supply on and remove the MoBO power completely?

im talking you have the risers and GPU’s powered and simple remove the other end of the USB cable from the motherboard
 

Orddie

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Are you expecting the video cards to explode? Nothing will happen.

i guess i was thinking the motherboard provided some type of grounding for the cards

with this logic, could one have a single PSU and two motherboards? say a 1000w PSU running all the cards and two 400w PSU running the motherboards?
 

thebufenator

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Easiest I think is to use the server PSU's with a breakout board. Use a Pico PSU from aliexpress for an extra $20 to power the board
 

BinarySynapse

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this brings up my point of the question. how much harm is happening by leaving the 2nd power supply on while doing work on the MoBo?


You'll want make sure both PSUs are off before you do any work. There are still signal grounds between the risers and the motherboards and doing something wrong can cause power to flow in unexpected ways.
 
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