DIY NAS or Synology DS1821+

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Certainly, if your plans involve tasks like machine learning, a traditional NAS may fall short of the required processing power. In this case, opting for a robust CPU such as the Ryzen 9, a 12th or 14th-gen i5 or i7 would be a prudent choice. However, if you decide to go for a NAS alongside your custom build, Synology offers compatibility lists for RAM and NVMe options for the DS1821+. You can find a list of compatible NVMe SSDs here and compatible RAM modules here.
https://www.synology.com/en-global/compa...d_internal
https://www.synology.com/en-global/compa...egory=rams