What about a motherboard limits how much ram you can put on it?
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Honestly, it’s more about the CPU. Modern CPUs have the memory controller chip built into the CPU itself. This will dictate the number of channels (how many RAM sticks it can communicate with simultaneously) and how much RAM it supports. “Low” end CPUs likely max out at 64 or 128 GB of RAM, for example.
Motherboards are built to certain families of CPU, and will be designed to those limits and capabilities. Generally the RAM is just connected directly to the CPU with only minor circuitry on the motherboard getting involved.
And of course, some motherboards really cheap out and only give 1 stick of RAM per memory channel. 2 sticks is possible and rather common per memory channel. On most consumer CPUs 2 channels is most common, so you’ll generally see either 2 or 4 RAM slots available.
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