windows os
power supply super flower x2 2000w
xeon w5-3425
ram 256
5x4090
256gb
help me understand
I connected 2x4090 to the main power supply which powers everything and 3x4090 to another power supply, all connected via riser x16 gen 4.0
The server works, it starts up fine.
But when performing tasks the protection in the power supply is triggered and reboots. There are suspicions that there is not enough power supply pcie slot
Translated with DeepL.com (free version)
The fact that you mentioned disabling one 4090 everything works fine. My first step would be to ask:
Is it just any 4090? Or just a specific one? Is that one on the psu the motherboard shares or the secondary one?
Plus it should be important to note that you should check the wattage breakdown of the power supplies. It may be 2000W total but have a lower total for 12v (where the majority of 4090’s power budget comes from). It is also important to mention that the RTX 4090 could have transient spikes long enough to trip a psu but too short for monitoring software to record. You may need to figure out if one or more of the gpus are spiking using an oscilloscope as power supplies with too little power headroom could trip from mere transients.
Considering it looks like the 4090s appear to be the same model it may be worth it to try to apply undervolts on each to try to increase the power headroom on your Power supplies. Amd typically undervolted cards also have less intense transients.
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