$ sudo lshw -class memory
  *-firmware:0            
       description: BIOS
       vendor: Award Software International, Inc.
       physical id: 0
       version: 6.00 PG (07/01/2002)
       size: 128KB
       capacity: 192KB
       capabilities: isa pci pnp apm upgrade shadowing escd cdboot bootselect socketedrom edd int13floppy360 int13floppy1200 int13floppy720 int13floppy2880 int5printscreen int9keyboard int14serial int17printer int10video acpi usb agp ls120boot zipboot biosbootspecification
  *-cache:0
       description: L1 cache
       physical id: 9
       slot: Internal Cache
       size: 128KB
       capabilities: synchronous internal write-back
  *-cache:1
       description: L2 cache
       physical id: a
       slot: External Cache
       size: 256KB
       capacity: 256KB
       capabilities: synchronous external write-back
  *-firmware:1
       description: BIOS
       physical id: 516
       version: ()
       size: 1003KB
  *-memory
       description: System Memory
       physical id: 1c
       slot: System board or motherboard
       size: 128MB
       capacity: 512MB
     *-bank:0
          description: DIMM
          physical id: 0
          slot: BANK_0
          size: 128MB
     *-bank:1
          description: DIMM [empty]
          physical id: 1
          slot: BANK_1
     *-bank:2
          description: DIMM [empty]
          physical id: 2
          slot: BANK_2