Epyc 9755 ES and MZ73-LM2 problems

[DanRR]

PCI power draw is 150W.
So
150W(PCI) + 300W (5V)+300*2(12V) = 1050 W

WAY NOT ENOUGH for Turins. They are hungry power monsters. My impression - each consumes 600W not 500. They both with memory and cooling draw more than 1.5KW (plus 10% adds PSU efficiency) so that the smell and smoke goes off the 1500W PSU and it shuts down the computer in 2-3 min of full load!

Needed solid confirmation that if do not use these new 12VHPWR cables (which looks like for sure can deliver 600W each but we can not used them) the regular 12V cabling is capable handling Turins 12V power requirements from these 2000W+ power supplies

"3x6pin power sockets on the motherboard" - do you mean 2x6pin power sockets on the motherboard ?

 

[RolloZ170]

150W(PCI) + 300W (5V)+300*2(12V) = 1050 W

sorry but who wants 300W 5V ?

 

[terryww]

Wonder how it worked for @mrpka. He shared it worked for him with Asrock PG1600 PSU, with all RAM slots populated + a GPU.

 

[DanRR]

sorry but who wants 300W 5V ?

You are right, 5V is just 100W (20-25A)

 

[DanRR]

Wonder how it worked for @mrpka. He shared it worked for him with Asrock PG1600 PSU, with all RAM slots populated + a GPU.

Even motherboards with 64-core Genoas can draw 1300W if you load all their threads. All works OK if you not overstress them.
Also I guess if having single rail PSU it will handle small overload more amicably. My PSU (Corsair HX1500i) shuts down and overheats at its peak draws. At 1300W it is OK. Also may be it needs 240V at such loads but I use 120 - its website even claims that it only works at 220-240V which is probably a typo

 

[terryww]

Hm... so there's a company making workstations with 9755 and they also include a 1600W PSU. I assume they tested with full load. So I guess the PSU single rail power isn't the only thing to look for in a PSU

 

[DanRR]

Hm... so there's a company making workstations with 9755 and they also include a 1600W PSU. I assume they tested with full load. So I guess the PSU single rail power isn't the only thing to look for in a PSU

This was with low core count CPUs, 16 as i see

 

[terryww]

I selected the 192 core Epyc (500W) and the PSU doesn't change in their configurator. Wonder if it's an error on their side or not.

 

[DanRR]

Guys,
Can you confirm that I correctly soldered adapter from the US home 240V washer/drier plug electric wiring to these specific ones used in SuperFlower PSUs? The forth pin - Ground is not used

I selected the 192 core Epyc (500W) and the PSU doesn't change in their configurator. Wonder if it's an error on their side or not.

One guy wrote me that sometimes when he used single PSU instead of dual ones like in servers he even had breakers cut the current in the house. Unfortunately I have zero experience with the server PSUs

1600W could be on the last drop limit. Though I have crashes even with the half of cores running (because processors still increase the frequency to the limit despite of that)

 

[DanRR]

I selected the 192 core Epyc (500W) and the PSU doesn't change in their configurator. Wonder if it's an error on their side or not.

Good idea would be to call them. But it is obvious that anyway the power draw of 128core chips at peak keeps the total power balance at the 1500-1600W level not even counting GPU

 

[terryww]

I wrote to them and got an answer after a couple of hours:
"The PSU on that page is fine, BUT "Selecting 500W CPUs will limit available power, restricting the video card to the RTX A1000 or 2000 Ada."
We don't have a higher PSU for that system. 1600W is the max a 15A power outlet will support."

Guess it's a US thing. In EU it's about 3kW per wall socket (avg home).

 

[DanRR]

Got Gigabyte respond about which power supplies they recommend for this board and from it I understood they do not recommend any specific one, just recommend to keep with the power balance. This is weird answer, because we do not know how much power is consumed by every port.

 

[terryww]

So a small update. Have looked for companies that build workstations and saw they also use Seasonic 2200W PX-2200. So now the ovecr current protection LED on the motherboard doesn't start blinking, but everything is the same - fans spin up for a few seconds and BMC isn't accessible afterwards (need to disconnect power to get access to it again).