New efficient build with Epyc Siena

Hi everyone, as the title says I am configuring a new build suited for efficiency.
I am interested in the epyc Siena lineup.

Things that I already own:

  • Case: Silverstone RM41-H08
  • Psu: corsair 850 RMI
  • Nic: Intel x710-d2 (10Gb)
  • HBA: lsi/Broadcom 9400-16i
  • 3 nvme drives, 3 data SSDs, 9 HDDs

Build:

  • CPU: 8024P (8Cores/16threads 80W TDP)
  • MB: Asrock Rack SIENAD8UD3

This motherboard is pretty appealing because it doesn’t come with any special NIC (wxcept for BMC) and it comes with the possibility of using the MCIO ports to connect up to 32 SATA. in this way I am able to save power by taking out the HBA and sell it. It is an interestering platform because is “cheap” but it keeps the possiblity of expandability in the future. The doubt I have is about the PSU because this MB required 3x8pin connectors and I don’t know if a “normal” ATX psu is able to provide it.
What do you think?

This is what the manual says

Mmh, the manual says something about a 24pin to 4pin power cable to connect to …ATX12V1, ATX12V2 or ATX12V connector? And a connection to the Micro-Fit Power connecter, I guess?

@prez02 I saw this photo where there is a “usual” 24 pin connector, I guess it is already included in the box right?

https://www.servethehome.com/asrock-rack-sienad8ud3-32x-sata-amd-epyc-siena-matx-motherboard-review/

Otherwise I need to buy another power supply right? If yes, what type of PSU is usually needed on server boards?

Only AsRockRack could tell how many of these connectors have to be plugged, especially if using a relatively low power part . But it looks like power is mostly supplied through these rather than the small 4-pin adaptor to the ATX connector.
A 1200-1600 W PSU may come with 3 CPU power connectors. Or you might order additional cables from the PSU manufacturer if the PSU is modular.
Note that if you do want 32 drives you’re going to need more than a mere 850 W. And then you’d want a real storage chassis rather than this Silverstone thing.

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Thanks for answer.
To be honest, I don’t think I will ever occupy all 32 ports :smiley:
I just noticed these MCIO ports (that I have never seen before) and it is very cool because you can really spare the extra HBA card (which lowers power as well)
Having said that, I would like to have a low power machine in idle ( because I run homeAssistant and other apps 24/7) and a couiple of VMs used for work only.
Do you think it is well suited for it?

I doubt that Siena and other big socket server CPUs fit the requirement “low idle power”… That’s not really a design requirement of theirs.

For low idle power, look into Atom C3000 (12 SATA but few PCIe lanes), old Xeon D-1500 (+HBA), or Xeon E/EPYC4004.