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When I lookup the no of empty slots in Lenovo L420. I shows that I have 4 slots and two of them are empty. But I cannot find the empty RAM slots when I opened the laptop. How can I know that this command is working properly. I want to add one more 4GB memory stick in the third slot.

sudo lshw -C memory

Here is the output

*-memory
       description: System Memory
       physical id: 1b
       slot: System board or motherboard
       size: 8GiB
     *-bank:0
          description: SODIMM DDR3 Synchronous 1334 MHz (0.7 ns)
          product: RMT3020EC58E9F1333
          vendor: Fujitsu
          physical id: 0
          serial: 415A7459
          slot: DIMM0
          size: 4GiB
          width: 64 bits
          clock: 1334MHz (0.7ns)
     *-bank:1
          description: SODIMM DDR3 Synchronous [empty]
          physical id: 1
          slot: DIMM1
     *-bank:2
          description: SODIMM DDR3 Synchronous 1334 MHz (0.7 ns)
          product: RMT3020EC58E9F1333
          vendor: Fujitsu
          physical id: 2
          serial: 41733A59
          slot: DIMM2
          size: 4GiB
          width: 64 bits
          clock: 1334MHz (0.7ns)
     *-bank:3
          description: SODIMM DDR3 Synchronous [empty]
          physical id: 3
          slot: DIMM3
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It might be that the motherboard can support 4 DIMMs, but the OEM chose to make only two slots available and omitted the other two to save space or something. Going by the Lenovo docs for adding RAM to the L420, only two are really available.

This SU post is informative:

It might be showing that the chipset supports more slots, even if the motherboard is not wired up to have those slots. It is more common these days for the chipset to know the other sots are not present (rather than just empty) but this is not always the case.

...

With laptops you often find that there are two slots, one on either side of the motherboard. In these cases one is usually easily accessible via the under-side of the case (under a cover held in place by one or two screws) and the other is on the other side of that and difficult to get to (you end up having to take the laptop completely apart if you want to get to it, and even then you might fins it isn't a real "slot" but some memory chips soldered direct to the board).

In my own 2012's System76 Bonobo, which does have 4 slots, two are on the easily-accessible end of the motherboard (near the hard disk and battery slots), and the other two require that I practically disassemble the laptop to access it. So I'd guess that Lenovo skipped out on less-accessible ports, reducing the cost and complexity.

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