A normal computer has features I want to avoid, such as size, heat, fans, large power supplies, etc. A single-board ARM or RISC computer has all the compute power and peripheral connectors I need. The only missing piece is sufficient RAM.
Khadas Edge2 Pro has 16GB of RAM, $340 tho, available now, even from amazon.
Radxa ROCK 5B also has 16GB of RAM, $220, available via ameridroid.
Jetson Orin NX 16GB has 16GB of RAM, $600, available in Dec, would probably also require a carrier board of unspecified price.