Corsair AX1200i burned plugs

[Etherion]

I have been a Corsair fan for years and the build of my workstations uses them. Reclienty things have been going bad fast. two of my workstations I use 2 Corsair AX1200i each. Running 4 RTX 3090s connected to a asus x99-e ws 10g each.

We have 3 RTX 3090s on one Corsair AX1200i and the mb and cpu plus a RTX3090 on the other. 

But one of the Corsair AX1200i started to cut out and we had it RMA's. Sadly the suppler only had HX1200 so we had to settle for that but now a second one is done this.

each of the PCIe power plugs are running one cable. We are not using the splits. 

all 3 GPU's have now burned plugs. Is this a PSU issue? How can we prevent this? The system under full workload uses 1800w at the wall. the CPU and MB uses 200w when no GPUS are connected. that is about 400W per gpu. 

Where did we go wrong? 

 

[LeDoyen]

yikes...

so each workstation has two AX1200i PSUs, and 4 RTX3090?

I would definitely redistribute the load.. 3 GPUs on one PSU looks to be too much. On hardware monitors you will see power load of 350-400W per card but transient loads will go over 550-600W, depending on what the workload is.

So you can definitely overload a 1200W PSU with 3 cards. The PSU itself can take a bit more than advertised, but ohms law is a b**** and that may explain why the connexion points are melty. 

Also if connectors are ran hot over long periods of time, they will start to oxydize, contact resistance will increase, and the PSU, doing its thing, will push more current to cope with GPU demand until one day OCP kicks in and you get shutdowns.

So, running two 3090 on one PSU will give them ample headroom, and on the other PSU, the CPU will not draw much which should keep average current draw  in the region of 1000W, giving still headroom for the GPUs connected to it.

Alternatively, last month Corsair launched two new HXi PSUs, with a 1500W model https://www.corsair.com/us/en/Categories/Products/Power-Supply-Units/HXi-Series-Fully-Modular-ATX-Power-Supplies/p/CP-9020215-NA

 

Hopefully the videocards PCBs aren't damaged.. those big connectors are easy to replace otherwise.

[jonnyguru]

On 8/19/2022 at 2:11 AM, Etherion said:

all 3 GPU's have now burned plugs. Is this a PSU issue? How can we prevent this?

When it's only burnt at the PSU, you can usually blame the cables, but when it burns at the GPU and the PSU, there's something else afoot.

What country is this installed in?

What is the temperature in the room that this is installed in?

Why is there so much dirt all over everything?  PSU has dirt.  GPU has dirt.  Dirt is an insulator, so that's not a good thing to see.