low power nas build
The motherboard depends entirely up to you.
You mention you want something with 8 sata ports - that kind of limits your choices. 6 or 4 sata ports are more common and cheaper.
For RAID5 you only need 3 hard drives and for RAID10 you need at least 4 drives.
If you go with ZFS, that can create a big drive out of multiple drives connected directly to the motherboard, without software raid and stuff like that. ZFS recommends using ECC memory because it stores a lot of information about how the data is spread around on various hard drives in the memory, so detecting errors in memory is kind of important. BUT, it will work without ECC memory. If you don't use ZFS, but some software or hardware RAID you won't need ECC memory.
For a ZFS based NAS, it may be cheaper to buy a board with just 4 or 6 ports but with support for ECC memory, as you could simply add a second HBA card with 4 or more sata ports if you need to.
To save money, i would go with a motherboard that can use a cpu with built in graphics... so right now pretty much Intel systems or FM2/FM2+ based solutions from AMD would be.
The AMD solutions are cheaper... would be slightly more power hungry as the processors on FM2/2+ are based on 28-32nm manufacturing process while Intel has some processors on 14-20nm but the power consumption differences are small enough.
FM2/FM2+ based processors are also much cheaper than Intel processors, you can buy for example A4-4000 (2x3.2 Ghz) is around 27$ in my country, a4-6300 (2x3.7ghz) is around 38$ ... and the cheapest fm2+ processor with integrated graphics A6-7400K (2x3.5ghz) is 52$
J4205 on that itx motherboard has a "cpu score" of 2400 ... a4-4000 (2x3.8ghz) has 1800 , a4-6300 has 2220, a6-7400k has 2800 ..
As for motherboards, the cheapest motherboards have 4 sata ports and no software raid support (or just raid 0 /1).
For 6 sata ports, a good board would be : MSI A88XM-E35 V2 : https://www.amazon.co.uk/MSI-A88XM-E35-FM2-AMD-Motherboard/dp/B00Y332BD4/
It has a pci-e x16 (which would accept x4,x8 or x16) and a pci-e x1 (which may be blocked by the card you put in the first slot if it has big heatsinks)
If you want 8 sata ports, you could have a look at GIGABYTE GA-F2A88XM-HD3P or Asrock FM2A88M Extreme4+ R2.0 , the second a few dollars/euro more expensive but with a better layout (the pci-e x16 slots spaced apart better)
Both give you 8 sata slots, one pci-e x16, one pci-e x4 (in a x16 physical format) and a x1 slot. So you could use the x16 slot for 10gbps network card (or a 4x1gbps card) and the x4 would still be available if you'd want to add a HBA card at a later time (to add more drives)
Really the only downside is the lack of ECC memory support for these systems, but you had no ECC support with that J4205 based board anyway.
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