system memory

Is there a software way to find out what my system's internal memory is? When I do it by examining the hardware I get either 2x64 or 2x128 MB. the label on the memory sticks upon visual examination is PC 100 322 620.
 
Also:
Code:
tingo@kg-vm$ sysctl hw.physmem; sysctl hw.realmem;sysctl hw.usermem
hw.physmem: 4143890432
hw.realmem: 4831838208
hw.usermem: 3528912896
 
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