[ahmed@ahmed ~]$ sudo lshw -C memory
  *-firmware
       description: BIOS
       vendor: Hewlett-Packard
       physical id: 0
       version: L06 v02.17
       date: 12/11/2014
       size: 64KiB
       capacity: 8MiB
       capabilities: pci upgrade shadowing cdboot bootselect edd int5printscreen int9keyboard int14serial int17printer acpi usb biosbootspecification netboot uefi
  *-cache:0
       description: L1 cache
       physical id: 5
       slot: L1 CACHE
       size: 96KiB
       capacity: 96KiB
       clock: 1GHz (1.0ns)
       capabilities: pipeline-burst internal write-back unified
       configuration: level=1
  *-cache:1
       description: L2 cache
       physical id: 6
       slot: L2 CACHE
       size: 1MiB
       capacity: 1MiB
       clock: 1GHz (1.0ns)
       capabilities: pipeline-burst internal write-back unified
       configuration: level=2
  *-memory
       description: System Memory
       physical id: 15
       slot: System board or motherboard
       size: 6GiB
     *-bank:0
          description: DIMM DDR3 [empty]
          product: A1_PartNum0
          vendor: A1_Manufacturer0
          physical id: 0
          serial: A1_SerialNum0
          slot: DIMM 4
          width: 64 bits
     *-bank:1
          description: DIMM DDR3 Synchronous Unbuffered (Unregistered) 1600 MHz (0.6 ns)
          product: HMT325U6CFR8C-PB
          vendor: Hynix/Hyundai
          physical id: 1
          serial: 0182D36F
          slot: DIMM 3
          size: 2GiB
          width: 64 bits
          clock: 1600MHz (0.6ns)
     *-bank:2
          description: DIMM DDR3 Synchronous Unbuffered (Unregistered) 1333 MHz (0.8 ns)
          product: EBJ20UF8BCF0-DJ-F
          vendor: Elpida
          physical id: 2
          serial: C0062D65
          slot: DIMM 2
          size: 2GiB
          width: 64 bits
          clock: 1333MHz (0.8ns)
     *-bank:3
          description: DIMM DDR3 Synchronous Unbuffered (Unregistered) 1333 MHz (0.8 ns)
          product: EBJ20UF8BCF0-DJ-F
          vendor: Elpida
          physical id: 3
          serial: F52623DF
          slot: DIMM 1
          size: 2GiB
          width: 64 bits
          clock: 1333MHz (0.8ns)