I've recently installed antergos, Arch Linux distro. I have 6GB of RAM and only 2GB is being detected. I installed the 64-bit version. On the BIOS, there is 6GB of memory. I have also used Ubuntu and it detects 2GB as well. Other Linux distros do the same. I also reseated my RAM slots with no luck.I've tried the following:$ free -m              total        used        free      shared  buff/cache   availableMem:           1964        1411          80          37         472         596Swap:          3814           0        3814lshw -c memory   *-cache:0       description: L1 cache       physical id: 5       slot: L1-Cache       size: 384KiB       capacity: 384KiB       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: 8MiB       capacity: 8MiB       clock: 1GHz (1.0ns)       capabilities: pipeline-burst internal write-back unified       configuration: level=2  *-cache:2       description: L3 cache       physical id: 7       slot: L3-Cache       size: 8MiB       capacity: 8MiB       clock: 1GHz (1.0ns)       capabilities: pipeline-burst internal write-back unified       configuration: level=3  *-memory       description: System Memory       physical id: 2c       slot: System board or motherboard       size: 6GiB     *-bank:0          description: DIMM Synchronous [empty]          product: Dimm0_PartNum          vendor: Dimm0_Manufacturer          physical id: 0          serial: Dimm0_SerNum          slot: Node0_Dimm0     *-bank:1          description: DIMM DDR3 Synchronous Unbuffered (Unregistered) 667 MHz (1.5 ns)          product: 1333EL Series          vendor: Undefined          physical id: 1          serial: 00000000          slot: Node0_Dimm1          size: 2GiB          width: 64 bits          clock: 667MHz (1.5ns)     *-bank:2          description: DIMM DDR3 Synchronous Unbuffered (Unregistered) 667 MHz (1.5 ns)          product: CMZ8GX3M2A160          vendor: Corsair          physical id: 2          serial: 00000000          slot: Node0_Dimm2          size: 4GiB          width: 64 bits          clock: 667MHz (1.5ns)     *-bank:3          description: DIMM Synchronous [empty]          product: Dimm3_PartNum          vendor: Dimm3_Manufacturer          physical id: 3          serial: Dimm3_SerNum          slot: Node0_Dimm3# lshw -short | grep 'System Memory'/0/2c                         memory      6GiB System Memory$ uname -aLinux <hostname> 4.12.4-1-ARCH #1 SMP PREEMPT Fri Jul 28 18:54:18 UTC 2017 x86_64 GNU/Linuxdmesg[    0.000000] Linux version 4.12.4-1-ARCH (builduser@nspawn-9860) (gcc version 7.1.1 20170630 (GCC) ) #1 SMP PREEMPT Fri Jul 28 18:54:18 UTC 2017[    0.000000] Command line: BOOT_IMAGE=/boot/vmlinuz-linux root=UUID=d597d2b0-dbcd-4e9b-8326-df9ce1547828 rw quiet resume=UUID=30a347fd-841f-4417-9dfe-c5b5ac793d4c[    0.000000] x86/fpu: Supporting XSAVE feature 0x001: 'x87 floating point registers'[    0.000000] x86/fpu: Supporting XSAVE feature 0x002: 'SSE registers'[    0.000000] x86/fpu: Supporting XSAVE feature 0x004: 'AVX registers'[    0.000000] x86/fpu: xstate_offset[2]:  576, xstate_sizes[2]:  256[    0.000000] x86/fpu: Enabled xstate features 0x7, context size is 832 bytes, using 'standard' format.[    0.000000] e820: BIOS-provided physical RAM map:[    0.000000] BIOS-e820: [mem 0x0000000000000000-0x000000000009ffff] usable[    0.000000] BIOS-e820: [mem 0x0000000000100000-0x000000007d478fff] usable[    0.000000] BIOS-e820: [mem 0x000000007d479000-0x000000007da36fff] reserved[    0.000000] BIOS-e820: [mem 0x000000007da37000-0x000000007de34fff] ACPI NVS[    0.000000] BIOS-e820: [mem 0x000000007de35000-0x000000007e101fff] reserved[    0.000000] BIOS-e820: [mem 0x000000007e102000-0x000000007e154fff] type 20[    0.000000] BIOS-e820: [mem 0x000000007e155000-0x000000007e155fff] usable[    0.000000] BIOS-e820: [mem 0x000000007e156000-0x000000007e35bfff] ACPI NVS[    0.000000] BIOS-e820: [mem 0x000000007e35c000-0x000000007e7fffff] usable[    0.000000] BIOS-e820: [mem 0x00000000f8000000-0x00000000fbffffff] reserved[    0.000000] BIOS-e820: [mem 0x00000000fec00000-0x00000000fec00fff] reserved[    0.000000] BIOS-e820: [mem 0x00000000fec10000-0x00000000fec10fff] reserved[    0.000000] BIOS-e820: [mem 0x00000000fec20000-0x00000000fec20fff] reserved[    0.000000] BIOS-e820: [mem 0x00000000fed00000-0x00000000fed00fff] reserved[    0.000000] BIOS-e820: [mem 0x00000000fed61000-0x00000000fed70fff] reserved[    0.000000] BIOS-e820: [mem 0x00000000fed80000-0x00000000fed8ffff] reserved[    0.000000] BIOS-e820: [mem 0x00000000fef00000-0x00000000ffffffff] reserved[    0.000000] NX (Execute Disable) protection: active
Linux is detecting only 2GB of RAM
linux;ubuntu;arch linux;antergos