I ordered a new computer and – as always – I think about upgrading it before it arrives.
I thought about adding another graphics card, which would probably push the current PSU beyond its limits. What measures do I have to take care of to combine the powered rails of the PSUs?
I searched for this question and found no conclusive answer, what I've found so far:
- some people strongly advise against it but don't provide a reason "don't risk it, simply buy a more powerful one".
- the power supplies will probably provide slightly different voltages, this will lead to the more powerful PSU providing most of the initial power until its voltage drops and the second one kicks in, too.
- some people advise using high current diodes. I have no problem with soldering on the wires of my PSU, but I have not seen any reason why I should do it in the first place and high current diodes are not that cheap, especially because I would need one for each powered rail on each PSU (8-10 pieces)
- there are some commercial solutions to this, like Add2PSU which is basically just a relay that switches the other power supplies.
So, can I assume it is safe to connect multiple power supplies to power my hardware?