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Topic: What happens when powered risers becomes unpowered? (Read 141 times)

full member
Activity: 210
Merit: 100
I'm running a rig consisting of 2 PSU which each power 6 GPUs (+ mobo/cpu/hdd on one).
Each GPU power lines and powered riser are linked to the same GPU, so if a PSU fails, the entire GPU will shut down (riser + power lines).

What would happen if my secondary PSU (the one with only GPUs linked) fails? I.e. 6 GPUs are only connected to the mobo using the USB3 cable to the riser, but riser power and GPU power is cut.
Will or could it harm my GPUs or mobo? How "independent" is a powered riser, power-wise? Will the GPU attempt to draw power from the mobo?

it won't harm your mobo or GPU, unless the power loss causes some sort of huge spike. I use 2 PSU's on all of my rigs and have never had an issue
sr. member
Activity: 847
Merit: 383
it will just crash the machine.  It's best to use one ps but normally in 2ps it just crashes
jr. member
Activity: 74
Merit: 1
I'm running a rig consisting of 2 PSU which each power 6 GPUs (+ mobo/cpu/hdd on one).
Each GPU power lines and powered riser are linked to the same GPU, so if a PSU fails, the entire GPU will shut down (riser + power lines).

What would happen if my secondary PSU (the one with only GPUs linked) fails? I.e. 6 GPUs are only connected to the mobo using the USB3 cable to the riser, but riser power and GPU power is cut.
Will or could it harm my GPUs or mobo? How "independent" is a powered riser, power-wise? Will the GPU attempt to draw power from the mobo?
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