Find physical memory on Unix/Linux systems

HP-UX:Find physical memory
For your really real physical ram try this:
#echo "selclass qualifier memory;info;wait;infolog"|cstm

The above command will show you how many memory slot and physical memory that plug in that slots in MB format.

#dmesg|grep Phy, this ouput will show yor memory in KB format

But I trust the first command that come from cstm is more valid.