It's surprisingly hard to do on a budget, since you're essentially locked into Xeon products and while CPUs are available used, getting a motherboard to support

It's surprisingly hard to do on a budget, since you're essentially locked into Xeon products and while CPUs are available used, getting a motherboard to support them isn't easy. The combo in this post, or waiting for a a full system to show up on ebay are probably the only real options. I'm really looking forward to DDR5 getting wide adoption, as that's really going to expand our options.