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If you want to learn the real memory size of your server please execute the commands related to your operating system

Solaris display Memory Size (RAM size):

prtconf | grep Mem

or

prtconf|grep -i mem

Available page sizes (SWAP) for Solaris:

pagesize -a

Display RAM Size on HP-UX:

dmesg

Display RAM Size on AIX

lsdev -C|grep mem

Now if memory device is mem0, then type

lsattr -El mem0

All linux distro:

free

Also almost all UNIX system support vmstat command, use vmstat to get more info.

vmstat