I am thinking to build an image (tdx-reference-multimedia-image) and sdk. Now I am using 4GB of RAM and Ubuntu 18.04 LTS. I got an error during compilation of tdx-reference-multimedia-image (do_fetch of linux-toradex and do_compile of mozjs). Let me know the minimum requirement of host PC configuration (RAM).
Read this message thread.
For 64-bit you really need at least 8GB of RAM per CPU core.
Personally I highly recommend one of these old things. Just be sure you tell them you want all of the drive caddies so you can add more drives. 128GB of RAM is a lot of breathing room. Those old CAD workstations/servers are available on eBay and other places for cheap these days.