would help you write the model and not "1600W PSU"
remove the CPUs out of the socket and make pictures, inspect the pins. have seen EPAC wrong seated in the Carrier.
help with gigabyte MZ73-lm0 motherboard and genoa-x 2x 9684x help
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remove the CPUs out of the socket and make pictures, inspect the pins. have seen EPAC wrong seated in the Carrier.
Oh, thank you, wouldn't think of that in a million years. OK, so I don't really know if the RAM is the problem then...
I've updated OP with PSU models.
I've also reseated the CPUs multiple times (actually noticed sbdy's fingerprints so it was cleaned and inspected by a serviceman (also the sockets)). The only thing I noticed with reseating is it really wants the pressure on the CPU socket, otherwise it doesn't even start.
I can access the BIOS, but any change I make, and then click on "Save & Exit" -> "Save changes", the changes don't persist
this settings are synchronised by BIOS in POST process. no effect without working CPU.
Power LC1650:
single Rail, good. but +5Vsb only 2Amps looks low for me, but of you have access to BMC this is not the issue.
Enermax 1700:
6 Rail PSU, can make trouble as you found out yourself.
your PSU clicks: sure you have correct modular cables ? same you get with wrong connexted PCIe cable, they have ground and +12V twisted.
on a dual socket motherboard, EPYC ES do work in pairs only. at least that was the case with previous gen's.
I really hope that's the case. With the new BIOS the notes say one has to manually set DDR5-6400 (which I can't) so hope trying with DDR5-5600 from QVL will solve this issue.
Where do I even find the specs what's required from the PSU? Would FSP CANNON PRO(ATX3.1) 2500W be enough - has 208A on 12V (single rail) and 4A on +5Vsb
Hm... not sure that it clicks, but after initial fan spinning there's _some_ noise coming from the PSU which I thought it was the over current protection (although the LC Power 1650W has 133A on 12V single rail so I thought it would be enough for 2 CPUs to boot). Nope. Have no idea if that 2500W FSP Cannon pro PSU would be enough as I plan to add 24 HDDs and at least 1 GPU. And that's the highest wattage ATX PSU I could find. Wonder what people are using - server PSUs with some kind of power distribution board since most server PSUs have just 1 slot (is it called a CPRS interface?)?
That's.... a never ending story of gotchas... I was planing actually to use them in a single socket motherboard as it's easier to find a PSU for that config.
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BIOS should be smart enought to set 5600 (JEDEC)
works at all other platforms, i can't imagen why here not.
2x CPUs TDP + GPUs max. * 1.25(headroom)
So that what I would expect - when I only have 2x CPUs, that would be (500W + 500W) * 1.2 = 1200W which the LC Power 1650W with 133A@12V should handle. But as said, only fans start spinning for a second and then it shuts down. ChatGPT talks about 130A of transient current for 1 CPU...
ask seller what he used for testing. but i doubt that is your issue.
2x 500W is very rare and new to the most of us.
btw: how to you cool the CPUs ? they get very hot even without load and die without cooling.
I'd thing the opposite - that everybody is trying out 256 core setups from ebay for about 4800$.
Arctic Freezer 4U-SP5, but obviously haven't tested full load yet. In the BMC I do see they're idling at around 50°C.
Regarding the PSUs, I think this is what I'll eventually have to end up with if the 2.5kW won't work (with more power of course, but this kind of setup which I haven't seen before): Great Wall High Efficiency Crps Dual Psu 1+1 Rated 550w 80 Plus Redundant Server Power Supply - Buy Dual Psu Ac Server Power Supply,Redundant Power Supply For Server,Great Wall 550w Redundant Power Supply For Server Product on Alibaba.com or just this Mocturnity Schaltnetzteil mit Steckernetzteil auf der Rückseite, Gleichstrom, 2400 W, für CRPS-Server: Amazon.de: Computer & Zubehör
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two seller, one sold, you ?
2nd CPU gets hot air of the first, don't work.
2x 500W needs water.
ask seller what he use for testing.
Think I saw Phoronix benchmarks on this cooler and it looked OK, though they didn't test 500W CPUs. I assume worst case I'll have to use a stronger fan. This CPUs are also ES so they don't go up to the same freq.
Looks like it
"Great Wall 1600W Dragon Full Module 1600W". I assume sth like that: https://www.aliexpress.com/item/1005007822313803.html?pdp_ext_f={"order":"-1","eval":"1"}
intel TDP = the whole package.
AMD TDP = cores, add TDP of IO die.
e.g. a AMD Ryzen TDP=65W eats 88Watt from the socket (PPT value)
if your EPYC is TDP=500W, add 60-90W (i guess, no data found at AMDs datacheets)