On the bench today I have an old Fujitsu Futro S930, running an AMD GX-424CC (2.4GHz quad core) and 16GB DDR3-1600.
Boot pool is an mSATA SSD on the board and a SATA SSD in the 'expansion bay' area, both directly connected to the SOC via the motherboard headers.
Storage pool is 4 x SATA SSDs also in the 'expansion bay' under the PCIE riser.
HBA (connected to PCIE riser) is a 81Y4494 4-channel SATA 'IT mode' card.
2.5GbE (NGFF) mPCIE card.
Power consumption as measured from the outlet:
Idle - 15W
Load - 32W (Writing @ 2Gbps)
Challenges with this one:
1 - Manual BIOS modification required to change the PCIE speed (for NIC and HBA) from gen1 to gen2. For more info, check out this link: https://www.reddit.com/r/homelab/comments/1d722m5/first_homelab_fujitsu_futro_s920/?rdt=65533
2 - Not a lot of space so the SSDs had to be removed from their 'housing' and stacked on m2 pillars (like motherboard standoffs but smaller...)
3 - Powering the SSDs; I had to make up a custom cable for this, splitting off from the ATX header (uses same connector as a FDD) on the motherboard. I cut and soldered together a FDD power cable from a scrap PSU, and some USB Header to SATA cables like these: https://www.ebay.co.uk/itm/205143130740?var=505859057128
I'm currently testing Plex with no issues so far, it's happy trans-coding a 4K BD-'backup' to my phone while also streaming other media to a couple of clients, while being hit with Crystal Disk Mark at the same time.
When streaming DVD-'Backups' to 2 clients the power consumption settled down to just 17W.
This box is fanless and completely silent, but it needs to be stood on it's end to encourage enough natural convection through it's internals.
In particular I noted that the PCIE SATA card gets rather warm, like many others I've seen it's designed to be fitted in a conventional server with quite aggressive case/chassis cooling.