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don't know if you plan to use Plex Hardware video decoding with a Plex Pass, but the i7 4790K is Haswell generation and doesn't support all of the "modern" integrated GPU decoding/encoding instructions; it can manage H264 but H.265/HEVC, for example, will be soft decoded, it will work but will rely on CPU horsepower instead of GPU, your nas will be less available for other tasks while decoding such videos and power consumption will rise higher. Well, you seem aware of those limitations, but I just wanted to confirm it might not be the most future proof choice. A 6 Sata Port motherboard is a good idea, with at least 3 pci-e slots for future extensions, one x16 for maximum compatibility and 2 others x4 or x1 should be enough. I won't go for ITX format motherboards, as they lack expansions slots and are very expensive, m-ATX is way cheaper and offer at least 3 pci-e slots. If size is not a problem, a full sized ATX is, of course, possible. If you want more than 6 Sata drives, without pci-e speed bottleneck at the cheapest price, you should go for a used Dell H200 Perc that you'll crossflash to LSI SAS 9211-8i (8 sata). If you don't mind slower bandwith, go for a 4 sata Syba PEX40064 (pci-e x1). On another pci-e slot, you could also add a dual port ethernet card, like a cheap used HP NC360T, and aggregate them in Synology network options. It's useful only if there are more than one Nas user connected at the same time, you won't get double speed transfert to one computer. If you plan to let your Nas plugged 24/7, you may take a look at used high/medium-range 7th/8th gen low power CPU, like the i5/i7-xxxxT, they will consume slightly the same than others at idle, but their maximum power consumption is 35W, instead of 88W for the i7 4790k. So they will need a lot less power at full power, plus H265/HEVC hardware decoding for Plex. Add a Platinum or even Titanium PSU which have better efficiency at low power, because your Nas will be around 50Watts most of the time and lower grade PSU are not very efficient at such low power. After a stable Asrock Q1900 till a year ago, I shortly tested a J4105M, but I can say the setup in my sig is the best and cheapest I could get for Xpenology 6.2.2, no hassles, load bios default and that's it. The integrated network works just fine with 6.2.2, only disable it if you add a dual nic card or you'll get 3 lan ports. That's more than enough power for Plex with HW decoding, Windows 10 VM, many dockers containers, surveillance station and more... Alas, can't predict the future regarding DSM 7

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