Graphics. You may not need to have a graphics card in nodes once they are installed. So you may find you can get a single low end card and use that to install e

Graphics. You may not need to have a graphics card in nodes once they are installed. So you may find you can get a single low end card and use that to install each host. Power and heat. Will you have enough power for the nodes? What is the power trade-off if you get low-end chips vs higher-end chips? Have a look at the Ryzen page on wikipedia to get a feel for power use of each chip. How will you understand how much cooling you need? (more cooling takes more power) RAM. How much does accuracy matter? Should you use ECC RAM? You can get UDIMMs to work in Ryzen kit, but not with the chips with integrated graphics card (i.e. avoid APU chips if you want ECC). Get Asrock or Asus AM4 motherboards, then get RAM like this - Samsung M393A4K40DB3-CWE. If you go cloud, you may find the hardware has ECC. IO. Once the grid-of-nodes is in place will you be moving data to functions, or functions to data? How much data are you moving over the network per-job? Might there be IO bottlenecks when you scale up? How detailed a model of IO can you build before you settle on hardware?