sudo lshw -C memory
[sudo] password for asus:
  *-firmware
       description: BIOS
       vendor: American Megatrends Inc.
       physical id: 0
       version: E502SA.300
       date: 07/20/2016
       size: 64KiB
       capacity: 6080KiB
       capabilities: pci upgrade shadowing cdboot bootselect socketedrom edd int13floppy1200 int13floppy720 int13floppy2880 int5printscreen int9keyboard int14serial int17printer acpi usb smartbattery biosbootspecification uefi
  *-memory
       description: System Memory
       physical id: a
       slot: System board or motherboard
       size: 4GiB
     *-bank:0
          description: DIMM DDR3 1400 MHz (0,7 ns)
          product: 8KTF51264HDZ-1G9P1
          vendor: Micron
          physical id: 0
          serial: 00000000
          slot: A1_DIMM0
          size: 4GiB
          width: 64 bits
          clock: 1400MHz (0.7ns)
     *-bank:1
          description: DIMM [empty]
          product: Array1_PartNumber1
          vendor: A1_Manufacturer1
          physical id: 1
          serial: A1_SerNum1
          slot: A1_DIMM1
  *-cache:0
       description: L1 cache
       physical id: 11
       slot: CPU Internal L1
       size: 112KiB
       capacity: 112KiB
       capabilities: internal write-back
       configuration: level=1
  *-cache:1
       description: L2 cache
       physical id: 12
       slot: CPU Internal L2
       size: 2MiB
       capacity: 2MiB
       capabilities: internal write-back unified
       configuration: level=2