I have 8Gb RAM, but the system report 6.8 Gb and in bios, it's says 8Gb. I don't have any swap on it. I'm on Lubuntu 18.04 64bit.

img here

sudo lshw -C memory
       description: BIOS
       vendor: AMI
       physical id: 0
       version: F.10
       date: 05/17/2018
       size: 64KiB
       capacity: 15MiB
       capabilities: pci upgrade shadowing cdboot bootselect edd int13floppy1200 int13floppy720 int13floppy2880 int5printscreen int9keyboard int14serial int17printer acpi usb smartbattery biosbootspecification netboot uefi
       description: System Memory
       physical id: 9
       slot: System board or motherboard
       size: 8GiB
          description: SODIMM DDR4 Synchronous Unbuffered (Unregistered) 2400 MHz (0,4 ns)
          product: HMA81GS6AFR8N-UH
          vendor: Hynix
          physical id: 0
          serial: 825AC392
          slot: Bottom - Slot 1 (left)
          size: 8GiB
          width: 64 bits
          clock: 2400MHz (0.4ns)
          description: SODIMM [empty]
          product: Unknown
          vendor: Unknown
          physical id: 1
          serial: Unknown
          slot: Bottom - Slot 2 (right)
       description: L1 cache
       physical id: b
       slot: L1 - Cache
       size: 192KiB
       capacity: 192KiB
       clock: 1GHz (1.0ns)
       capabilities: pipeline-burst internal write-back unified
       configuration: level=1
       description: L2 cache
       physical id: c
       slot: L2 - Cache
       size: 1MiB
       capacity: 1MiB
       clock: 1GHz (1.0ns)
       capabilities: pipeline-burst internal write-back unified
       configuration: level=2
       description: L3 cache
       physical id: d
       slot: L3 - Cache
       size: 4MiB
       capacity: 4MiB
       clock: 1GHz (1.0ns)
       capabilities: pipeline-burst internal write-back unified
       configuration: level=3

free -h
              total        used        free      shared  buff/cache   available
Mem:           6,8G        1,1G        4,4G         63M        1,3G        5,1G
Swap:            0B          0B          0B
  • 2
    Does your video card have its own RAM, or does it steal ram from your system? Likewise some systems can use system-RAM to store parts of ROM/flash-memory in them to speed up the system as RAM is faster (configurable sometimes in UEFI/BIOS). ie. some of your system memory may be used by your hardware, or it may not - only you or someone with access to your machine hardware can know what you have, and what options you have used. – guiverc Jul 13 at 9:43
  • 1
    Where does "the system report 6.8Gb"? – terdon Jul 13 at 11:32
  • @terdon in LXTask and CPUG. – Rahadian Wiratama Jul 13 at 11:36
  • Please edit your question and post the output of free -h. – terdon Jul 13 at 11:38
  • @terdon yep, has been edited – Rahadian Wiratama Jul 13 at 11:43

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