We run Watchout very successful on WIN 10 on more than 20 machines for around a year now.
We also builded machines for some clients based on our WIN 10 image.
Get the fastest single core performance processor you can get. Currently this is either the XEON 1650 V4 or the i7 version of it.
We are experimenting with the new generation but this is still under development and I can't tell you exactly what to buy if you want to be safe!
Also think about PCIe lanes. With additional SSD storage and maybe capture cards you need a lot of storage! Your choice just got 28 PCIE lanes.
If this is enough for you OK. But you will be at the limit of what is possible very soon with PCIe cards.
From the current Intel range I just see the i9 7900x as suitable for WATCHOUT.
Still I prefer the new Xeons. They are even faster than the i9. Dont think about Turbo Boost 3.0. The most important thing is a stable frequency as high as possible for as many cores as possible. The indicator is the ALL CORE TURBO. Means how much speed do you get if all cores are working on full power.
The WX7100 is a good choice. Get it together with a S400 sync card to sync outputs for LED walls.
Emulating EDIDs is a absolute must have! Worth spending the money for a professional card.
If you use ACTIVE adapters you get every signal you want out of the card. The only adapter i can recommend is the CLUB 3D DP to HDMI 2.0
Besides the system SSD stay away from m2 SSDs.
They are getting way to hot and drop in performance. There are some versions with active cooling but nothing I would put into a machine.
We prefer Intel or Micron PCIE SSDS. They are made for 24/7 usage and deliver up to 3250MB/sec.
Regardles of what people are saying, its fine to also run them in raid configurations.
Our current demonstrator goes up to 15.000 MB/s. Think about running uncompressed picture squences in 4K.
Every layer of 4K uncompressed video will need arround 1200-1600 MB per second. Of course this comes at a price. These disks are not cheap and they might fail like others do.
But a least you will have a red LED at the back of your machine reporting the problem. You also got long waranty periods on these disks so in case they fail you will get
a new one fast.
About RAIDs in general. I would trim the machines for absolute performance. A software raid 0 can give you more then 6500 MB/sec on your machine with 2 PCIE NVME disks. Backups should either be made through a content management workstation or on a second backup system. Usually on big productions we do both! Some Raids I got im my hands had caching functions activated. This is totaly dangerous because this function might work good for some small office files but not for delivering stable video streams. By the way - dont buy SATA SSDS go NVMW for the IOPS. These are relevant if you want to play uncompressed TIFF or TGA sequences. Also a lot of RAID 5 controllers are the bottleneck for this. A single Micron or Intel PCIE SSD should give you the storage and performance needed.
10G Network. Absolute standard if you build a machine now! And only with Win 10 you will be able to use the whole 10G. Of course depending on the content. We found that NVME on Production and Display Computer gives you the best performance. 10G cards are not expensive anymore. Intel X-550 is the card to buy.
Bios: Please deactivate all energy saving functions on the processor: C-States, Thermal Protection and most important Intel Speed Step technology. If you got these functions active the machines will run out of sync!!!
The real challenge besides the right hardware choice is of course Win 10. Its a beast to configure and we spent a LOT of time testing different configurations. Once its running its the best system you can run Watchout on. We are currently able to playback 4x4K TGA sequences out of one machine and I guess it will be even more with the next generation we are currently developing. Besides the regular Watchout tweaks we got a list of arround 100 more tweaks for WIN 10. In the end its really a lot to do and you need profund IT knowledge to get the best performance out of the machines. It really becomes an industrial PC and when looking at the taskmanager there should be 0% CPU load and the absolute minimum of processes running in the background. We customize systems for usage as media servers and if you need help you can write me a PN.
If you did all this you have to test your setup a lot to provide absolute stability and performance. The advantage of building your own PC can become a disadvantage if people build machines which crash and dont deliver performance. Thats why competitors of Dataton sell their machines for a lot of money. Because they provide everything from Software to hardware. Still if you do it the right way you will even be able to outperform systems which cost 50.000 $ or more! Of course high end Watchout Systems also cost a lot of money but its cool that you can build a machine which fits your purpose. The WATCHOUT advantage
The question in the end is: What do you want to do with the machines?