Looking but hard to find my question about external ram? Has this method been talked about or tried before?

Now we know ram can't connect via usb too slow, obv been tried and never works

But if you had a ram stick in its own slot externally, like a motherboard slot which connected to board via wires, ribbon cable etc. and directly connect it to the motherboard, that way its not trying to pass through anything and has direct access

I would assume this would need a custom slot/work to the actual board and pathing to allow it to fully function, but has it not been tried before?