Yes I did this back in the 2014 days alot. PSUs back then were expensive and GPUs required more power so it was very common practise. However there are a few things to keep in mind.
You cannot mix any of the +12V together. So don't plug in PCIe to one PSU while into the other PCIe port on the same GPU plug in to the other GPU. These days most GPUs have 1 PCIe so it shouldn't be a problem.
However the +12V for the riser should also come from the same PSU to be safe. Normally the +12V going into the GPU from the riser is seperate from the +12V going into the PCIe slot. I've measured this myself with a multimeter.
The way people burned PSUs and Mobo's back in 2014 was because they attached +12V to one PSUs to the ribbon risers and +12V from another PSU to the motherboard and there was current feedback and it destroyed the motherboard typically. However with USB risers it shouldn't be much of an issue.
Another thing to do is make sure to ground the PSUs together. Just connect the grounds together. And make sure the 2nd PSU always has a load on in case the main PSU shuts off for some reason.
Thank you!
If I am understanding correctly: One PSU for the motherboard and drive. A second PSU powering the PCIe cards and the GPU's.
Am I pointed in the right direction?
Thanks again.
Yes but the mobo psu if it has capacity can power gpu/riser....just dont mix psu2 with and card/riser that goes to psu 1.
As the song goes....you gotta keep’em separated!
So if you have a 1000watt on mobo you can run several cards/risers off it and the mobo...then the other cards and their risers would all go to psu2. The only time it would be different is with a h110 mining board that has 3 psu hook ups built on it.
