Comment by AnthonBerg

It’s interesting to consider the difference.

The price grows when going to server/workstation motherboards / CPUs.

And: What if you already have a 16-slot motherboard fully populated with RAM? You can add a whole another computer with 16 more slots, but that’s quite a bit of iron, and: How best to connect the two? Does there exist an interlink that shunts data between two computers at full PCIe 4.0 x4 speed? Or x8? And how to control processing on the second computer?

I’m sure there are bigger motherboards yet, but afaik it always comes with further components – say, more physical CPU sockets that need to be populated?

There are probably situations where this hardware is the simple way of doing a job.

Also: If the current motherboard already has a unused PCI slot, then it’s kiiiiind of a free return on investment to use that bandwidth. By putting the existing I/O controller to use.