Dell inspiron 5593 maximum ram supported

1- 64GB according to crucial and 16GB according to a another website. But its 16GB ram. I see alot of people saying it. And even there is a threads like this one saying its 16GB.

2- Your computer has only 2slots.

3- It depends too on your OS release and cpu, check this for more information: https://docs.microsoft.com/en-us/windows/win32/memory/memory-limits-for-windows-releases