Maximum RAM currently supported by any motherboard?

Someone asked me a question earlier, that I was unable to answer. The question was, "What is the maximum amount of RAM that any current motherboard on the market, can support?" I had no idea. I have seen tons of boards with 8 slots, supporting a maximum of 128 Gigabytes of RAM.

If I am not mistaken, Windows 10 is supposed to be able to support up to something like 2 Terabytes of RAM?

Anyway, does anyone here know the answer?

Thanks,
 
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