No I mean like I will sell you one of those. What dimensions do you need to know?

E: Also I have an old gaming pc in a gaming pc sized case.

May I interest you in a Lenovo thinkcentere m700, hp z230, or dell 3040 sff or 7040 mt?

If you have a computer repair place near you just go there and say “I have $100 and I want to trade it for a motherboard, cpu and cooler that fits in this case and takes this ram.”

They’re gonna have an old 8th gen + intel or am4 setup that will work for you.

How much you looking to spend?

Oh I didn’t even look up motherboard availability, I only know of dual core no multithreading celeron lga 1200 CPUs. You’re gonna have problems accomplishing your goals with that.

If your case can mount the sata drives and your power supply has a 24 pin, four pin and enough sata connectors for your drives then all you need is a ddr4 motherboard, cpu and cooler.

If you’re stuck on off the shelf stuff then maybe a b550 and some am4 cpu, if you can mess around with weird shit there’s a bunch of odd sample intel cpu/motherboard combos floating around the aliexpress sphere.

Some of the am4 boards have multiple nics so that’s probably worthwhile for your use case.