Multiple GPUs in Server, One is Causing Short

[lotsoflinux]

I have a server with 3 MSI Gaming Trio 4090s in it that would not power on. I swapped out the power supply and only connected the mobo and CPU to confirm the power supply was bad. After confirming I powered it back off and connected the GPUs, but when I tried to power it on the was a click and then nothing. Now the second power supply is dead too. I don't have the spare power supplies to test one by one with the GPUs since they are about $600/each. How can I test just the GPU to see which one is causing the PSU's to short out?

[jaslion]

Please list all your specs.

 

Also a psu shouldn't just die if it's decent what psu's are they? Make and model.

[igormp]

11 minutes ago, lotsoflinux said:

I have a server with 3 MSI Gaming Trio 4090s in it that would not power on. I swapped out the power supply and only connected the mobo and CPU to confirm the power supply was bad. After confirming I powered it back off and connected the GPUs, but when I tried to power it on the was a click and then nothing. Now the second power supply is dead too. I don't have the spare power supplies to test one by one with the GPUs since they are about $600/each. How can I test just the GPU to see which one is causing the PSU's to short out?

Do you have a multimeter? If it's shorted, try to test for continuity on the 12v and gnd lines.

[Yua]

These are the power pins in a PCIE slot.

 

 

With a mulimeter in continuity mode, you can test for short on 12V and 3.3V.

Place a probe on a ground contact, which can be any video output external chassis (the outer case of an HDMI, for example), with the other brobe on those pins from the picture and the 12 volt inputs that comes from the power supply.

If you see zero resistance and a long beep sound,. You have a short.

 

I don't know if this is your issue, but I'm answering what you asked.

 

 

PCIE X16 Pinout.pdf

[Agall]

Not sure why you'd want to run 3 RTX 4090's off the same power supply, regardless of how good it might be.

 

Setup like that is where you'd want a motherboard with an aux VGA 6,8 pin for the PCIe bus, since each of those cards can and will draw up to 75W from the PCIe bus. Only boards I can think of that still include that are EVGA motherboards and maybe HEDT.

[lotsoflinux]

4 hours ago, jaslion said:

Please list all your specs.

 

Also a psu shouldn't just die if it's decent what psu's are they? Make and model.

The power supply is a Hela 2050 Platinum, CPU is i7 13700K with 128GB of RAM. It is running Ubuntu 22.04 server with no GUI.

 

4 hours ago, igormp said:

Do you have a multimeter? If it's shorted, try to test for continuity on the 12v and gnd lines.

Getting one tomorrow, going to use the below post to try and check continuity. 

 

4 hours ago, Yua said:

These are the power pins in a PCIE slot.

 

 

With a mulimeter in continuity mode, you can test for short on 12V and 3.3V.

Place a probe on a ground contact, which can be any video output external chassis (the outer case of an HDMI, for example), with the other brobe on those pins from the picture and the 12 volt inputs that comes from the power supply.

If you see zero resistance and a long beep sound,. You have a short.

 

I don't know if this is your issue, but I'm answering what you asked.

 

 

PCIE X16 Pinout.pdf 44.08 kB · 1 download

Thanks, I think this will be very helpful in my quest for answers.

 

3 hours ago, Agall said:

Not sure why you'd want to run 3 RTX 4090's off the same power supply, regardless of how good it might be.

 

Setup like that is where you'd want a motherboard with an aux VGA 6,8 pin for the PCIe bus, since each of those cards can and will draw up to 75W from the PCIe bus. Only boards I can think of that still include that are EVGA motherboards and maybe HEDT.

We just use a lot of GPU's so each of our servers has 3x 4090s or 4x 3090 TIs. The mobo is an ASUS Z690 Prime in a server chassis.