[dba-Tech] RAM question

Is there a way to tell what kind of RAM is installed in a box without
opening it? I'd like to know the type of RAM, the size of the modules, the
speed, etc., and determine all this while the box is running. Even better,
although I don't expect it, would be to know how many slots are available.
I'll tear the box open if need be, I guess, but it's a hassle I'd rather
avoid.

TIA,
Arthur