If you want more oomph than Xeon D, there's some Xeon Silver used on ebay
Silver 4110 for $400 each obo Intel Xeon Silver 4114 Ten-Core Skylake Processor 2.2GHz 13.75MB LGA 3647 CPU | eBay they're about $500 new so maybe you can go under $400 by some amount
Here's the Silver 4114 for $660 each obo Intel Xeon Silver 4114 Ten-Core Skylake Processor 2.2GHz 13.75MB LGA 3647 CPU | eBay they're about $730 new so again, use the BO.
There's even a crazy mobo on ebay Supermicro X11DPL-I Server Motherboard Intel Chipset Dual LGA-3647 w/ I/O Shield | eBay only 4 dimms per cpu and the sockets look funny but $199 for 2s board.
Here's a better board for one of the silvers Supermicro Motherboard MBD-X11SPI-TF-O (X11SPi-TF) ATX LGA 3647 | eBay $425
If you can get a good BO on the chips that's $800-100 for a setup.
Silver 4110 for $400 each obo Intel Xeon Silver 4114 Ten-Core Skylake Processor 2.2GHz 13.75MB LGA 3647 CPU | eBay they're about $500 new so maybe you can go under $400 by some amount
Here's the Silver 4114 for $660 each obo Intel Xeon Silver 4114 Ten-Core Skylake Processor 2.2GHz 13.75MB LGA 3647 CPU | eBay they're about $730 new so again, use the BO.
There's even a crazy mobo on ebay Supermicro X11DPL-I Server Motherboard Intel Chipset Dual LGA-3647 w/ I/O Shield | eBay only 4 dimms per cpu and the sockets look funny but $199 for 2s board.
Here's a better board for one of the silvers Supermicro Motherboard MBD-X11SPI-TF-O (X11SPi-TF) ATX LGA 3647 | eBay $425
If you can get a good BO on the chips that's $800-100 for a setup.