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Author Topic: One PSU hotter than other  (Read 86 times)
gameboy366
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June 19, 2019, 03:23:25 AM
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My rig has 9*RX570 which runs on two Antec HCG 1000 PSU. One PSU which powers the MB through a dual PSU power cable spilliter has 4 GPUs and the other one has 5 GPUs.

The PSU which has 5 GPUs is very hot compared to the main PSU (4 GPU + MB). My city temperature is 30-40C. Do you think it could be due to PSU spilliter cable? I am thinking of ordering Add2PSU and replace the spilliter cable. Btw my GPUs are undervolted and bios modded.
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joblo
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June 19, 2019, 03:45:49 AM
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You either have a power imbalance or a failing PSU. Do some troubleshooting
to figure out which. Swap the mobo power with a GPU and see if it's still the PSU
powering the mobo that gets hot or the one you moved to power 5 GPUs.

My guess is you're probably using unpowered risers so the mobo is powering all the
PCIe slots creating a huge load on the PSU powering the mobo.




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philipma1957
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June 19, 2019, 04:11:28 AM
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Nine GPUs a mobo 2 psu ssd ram cpu  Well over 2000 if new.

So first question is  why don’t you own 2 indentical kwatt meters and see if they pull the same power.

If they do that. Then the hot one (psu) has an issue.

If one unit is doing a lot more watts then you need to trouble shoot.

Each and every psu each and every riser.

That is complex.

Start by doing .

Mobo plus 1 GPUs

Two GPUs

See how close that is.

Add 1 GPUs to go to m+2 GPUs vs 3 GPUs

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gameboy366
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June 19, 2019, 04:36:01 AM
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You either have a power imbalance or a failing PSU. Do some troubleshooting
to figure out which. Swap the mobo power with a GPU and see if it's still the PSU
powering the mobo that gets hot or the one you moved to power 5 GPUs.

My guess is you're probably using unpowered risers so the mobo is powering all the
PCIe slots creating a huge load on the PSU powering the mobo.




My risers are powered. And the hot PSU is actually the one that's not connected to MoBo but has 5 GPUs. I know it is highly inaccurate but HiveOS says that each of my gpu is generating around 65-70W and the whole rig around 600W. The rig was assembled in August last year and the winters were close so the temp. was not a big issue. I just recently started it again after 5 months during peak summers and fear this it might blow up or something. It is high quality Antec PSU though : HCG X1000, japanese capacitors and all that.
gameboy366
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June 19, 2019, 04:51:43 AM
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One more abnormal thing with the hot PSU from the start was that sometimes when I switch on the power outlet of the rig, the PSU fan spins for a second even though I haven't pressed the CPU power button (which starts the rig and both PSUs).
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June 19, 2019, 05:43:39 AM
 #6

If these PSUs are identical then the first step is just to swap them and see what happens.

If the original hot PSU is still hot then the PSU is basically faulty and just send it in for an RMA.

Tell them you bought 2, one runs very hot to the touch (if thats the case) and you swapped them and the problem went away, this way it means that the PSU is faulty.

Try and listen in, maybe the fan bearing is dying and its what causes it to overheat.

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