What is the maximum supportable RAM by Linux? Assume that hardware is/supports 64-bit. Among all Linux distros.
Does it go up to 16 exabytes, or is it limited like with Windows which I believe is 192 gigabytes?
Red Hat Enterprise Linux (RHEL)
These are probably a good basis, looking at RHEL6's capabilities, they're covered here, titled: Red Hat Enterprise Linux 6 technology capabilities and limits.
Also if you take a look at the kernel docs, Documentation/x86/x86_64/mm.txt:
So 247 bytes = 128TiB