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Ubuntu 16.04, sudo lshw -class memory command outputs 4 memory modules with different width property:

  *-memory
   description: System Memory
   physical id: 19
   slot: System board or motherboard
   size: 8GiB
 *-bank:0
      description: DIMM 400 MHz (2,5 ns)
      physical id: 0
      slot: A0
      size: 2GiB
      width: 2244 bits
      clock: 400MHz (2.5ns)
 *-bank:1
      description: DIMM 400 MHz (2,5 ns)
      physical id: 1
      slot: A1
      size: 2GiB
      width: 2244 bits
      clock: 400MHz (2.5ns)
 *-bank:2
      description: DIMM 400 MHz (2,5 ns)
      physical id: 2
      slot: A2
      size: 2GiB
      width: 130 bits
      clock: 400MHz (2.5ns)
 *-bank:3
      description: DIMM 400 MHz (2,5 ns)
      physical id: 3
      slot: A3
      size: 2GiB
      width: 130 bits
      clock: 400MHz (2.5ns)

What does width mean? Why it differs so much? Modules 2,3 are from a different vendor than 0,1.

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  • en.wikipedia.org/wiki/Memory_bandwidth
    – user772515
    Sep 22, 2017 at 8:16
  • @MichaelBay hm, couldn't find an answer there
    – Slaus
    Sep 22, 2017 at 8:26
  • Why not? It explains exactly what memory bandwidth is and they're different because the modules are different. For more informations contact the manufacturers.
    – user772515
    Sep 22, 2017 at 8:47
  • 1
    @MichaelBay So you're saying the "width" from lshw is short for the memory's bandwidth? So here when it says width: 130 bits it means the bandwidth is 130 bits/second? Or 16.25 bytes/second? Seems slow, even the other 2244=280 bytes/second. Maybe it's in Mbps or something (I don't really know either, but it sounds reasonable, you'd think they'd flesh out the man page with a little more info)
    – Xen2050
    Sep 22, 2017 at 8:55
  • 2
    Seems like a bug to me, my systems (tested on 3 computers) show "width: 64 bits", which matches the data bus width for DDR3 and DDR4.
    – pim
    Sep 22, 2017 at 10:33

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