I don't know for certain, but I think you'll ultimately have to decide between either low power consumption or 4k transcoding. I doubt you'll be able to achieve both.
Is 60W a lot? I think a system with a few mechanical hard drives and fans will be at least half of that regardless of the processor used. Please correct me if I'm wrong.
It definitely is "a project" as it is a custom board from gigabyte, designed to be used in a Mining rig. It abides by ITX standards however an ATX adapter is required for power delivery to the board.
I got mine from Ramkönig, bought 32GB of registert ECC ram on eBay (27€) so the total for the server (if you have a case and HDD) for me was under 100€.
Power consumption is at around 20-30 watts in idle and according to the tdp of the CPU 45W higher when under load.
What is also interesting is the option to use an M2 SSD on this board.
It also has 4 SATA ports.
I think your best bet will be an SFF/USFF/1L box used on eBay. The tiny/1L ones mostly have energy-efficient CPUs (like intel T-suffix SKUs), but they also don’t support the SATA connections you specified (unless you go for an external USBC/TB3 enclosure, which many people do)
If you drop the SATA req and go for USB instead, you could use any small form factor machine like the ThinkCentre 715q or the likes. I have one of those with a Ryzen 2400 with 4x 8TB external disks. I've clocked the whole thing pulling ~50W at full tilt.
I’ve had similar requirements for a few years. Finally settled on 8 bay synology with a dell micro optiplex. I have a 10gb card in the synology and actually use a usb to 2.5gbE in the dell with zero stability issues. Some synology products can transcode a stream or two of 4k with quick sync but not many of the 8 bay ones. I have a 9th gen i5 with 32gb of ram that handles all my transcoding needs. Done 2x 4k transcodes with no issues while also streaming other 1080p for additional users.
Maybe check some options with Intel N300/305. To be honest I don't know how good Intel Quicksync is, so you might need an external GPU as well. You also need a power efficient DC PSU at low wattage.
It is also important what components you put inside, like low-end SSDs have the lowest power consumption and maybe are your best bet. I would also recommend you buying a 5400rpm power efficient HDD if you need it. Disabling all unnecessary ports in the bios can also help lower your power consumption and tweaking the power limits of the C-states, and enabling C10.
My suggestion is first try to play a bit with your current server BIOS settings and the power optimization in Linux. If your power consumption at full load is like 90-100, maybe consider swapping your current PSU with a DC one, as they have superior power efficiency and after each change evaluate the performance and the power consumption both on idle and on 100%.
Thanks for pointing out the ports, I'll see which ones can be deactivated. I've been reading up on c states lately.I just suspect that my configuration leaves little room for maneuver.The microserver is currently running proxmox with openmediavault and a vial pihole on lxc. I would swap the vial pihole for a raspberry and only use OMV.
Keep in mind that RPI is good for containers, but not for virtualisation, so if you want to run some VMs or have proper expandability I would advise you against RPI.
Plus disabling the ports won't make a big difference I presume, a couple of Watts at best.
I recently bought an N100 powered firewall appliance and the idle consumption is around 13 Watts, with two SSDs and 32Gb of RAM, a bunch of USB and video ports and 4x2.5Gbps ports all switched on. People are even reporting that this can be pushed down to 7-8W, comparable to what you would get with RPI.
The i3-N305 has 8 physical cores and TDP of 15Watts, which can easily be reduced to around 9-10.
sounds like you might wanna underclock stuff, LTT made a video about a cost competitive gaming pc which is more effficient than an equivalent gaming console. or get something like a rockchip-based Raspberry pi clone with pci-e slots
Jellyfin alone needs at least 8 GB of RAM, and since I would like to have room for improvement, 16 GB is the minimum for me.I have two unused m.2ssds lying around here that I would like to install. Of course this would also be possible via a PCI board, but I would like to keep that free if possible.