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Gigabyte replaced my dead GA-870A-UD3 motherboard with a GA-970A-UD3. However, "free" and cat /proc/meminfo only show 8GB of RAM:
cat /proc/meminfo
MemTotal:        8155016 kB
MemFree:          253264 kB
...

However, lshw does see all 12gb:
lshw | grep -m 1 -A 50 "*-memory"
     *-memory
          description: System Memory
          physical id: 2c
          slot: System board or motherboard
          size: 12GiB
        *-bank:0
             description: DIMM DDR3 Synchronous 667 MHz (1.5 ns)
             product: F3-10666CL9-4
             vendor: Undefined
             physical id: 0
             serial: 00000000
             slot: Node0_Dimm0
             size: 4GiB
             width: 64 bits
             clock: 667MHz (1.5ns)
        *-bank:1
             description: DIMM DDR3 Synchronous 667 MHz (1.5 ns)
             product: F3-10666CL9-4
             vendor: Undefined
             physical id: 1
             serial: 00000000
             slot: Node0_Dimm1
             size: 4GiB
             width: 64 bits
             clock: 667MHz (1.5ns)
        *-bank:2
             description: DIMM DDR3 Synchronous 667 MHz (1.5 ns)
             product: F3-10666CL9-2
             vendor: Undefined
             physical id: 2
             serial: 00000000
             slot: Node0_Dimm2
             size: 2GiB
             width: 64 bits
             clock: 667MHz (1.5ns)
        *-bank:3
             description: DIMM DDR3 Synchronous 667 MHz (1.5 ns)
             product: F3-10666CL9-2
             vendor: Undefined
             physical id: 3
             serial: 00000000
             slot: Node0_Dimm3
             size: 2GiB
             width: 64 bits
             clock: 667MHz (1.5ns)

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: linux-image-3.2.0-63-generic 3.2.0-63.94
ProcVersionSignature: Ubuntu 3.2.0-63.94-generic 3.2.57
Uname: Linux 3.2.0-63-generic x86_64
NonfreeKernelModules: fglrx
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
ApportVersion: 2.0.1-0ubuntu17.6
Architecture: amd64
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 0: SB [HDA ATI SB], device 0: VT2020 Analog [VT2020 Analog]
   Subdevices: 2/2
   Subdevice #0: subdevice #0
   Subdevice #1: subdevice #1
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC2:  morse      2845 F.... pulseaudio
 /dev/snd/controlC1:  morse      2845 F.... pulseaudio
 /dev/snd/controlC0:  morse      2845 F.... pulseaudio
CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211 not found.
Card0.Amixer.info:
 Card hw:0 'SB'/'HDA ATI SB at 0xfeb00000 irq 16'
   Mixer name	: 'VIA VT2020'
   Components	: 'HDA:11060441,1458a014,00100100'
   Controls      : 48
   Simple ctrls  : 24
Card1.Amixer.info:
 Card hw:1 'Generic'/'HD-Audio Generic at 0xfea40000 irq 76'
   Mixer name	: 'ATI R6xx HDMI'
   Components	: 'HDA:1002aa01,00aa0100,00100200'
   Controls      : 6
   Simple ctrls  : 1
Card1.Amixer.values:
 Simple mixer control 'IEC958',0
   Capabilities: pswitch pswitch-joined penum
   Playback channels: Mono
   Mono: Playback [on]
Card2.Amixer.info:
 Card hw:2 'Generic_1'/'HD-Audio Generic at 0xfe640000 irq 77'
   Mixer name	: 'ATI R6xx HDMI'
   Components	: 'HDA:1002aa01,00aa0100,00100200'
   Controls      : 6
   Simple ctrls  : 1
Card2.Amixer.values:
 Simple mixer control 'IEC958',0
   Capabilities: pswitch pswitch-joined penum
   Playback channels: Mono
   Mono: Playback [on]
Date: Wed May 21 16:34:53 2014
HibernationDevice: RESUME=UUID=f938a5e5-3e60-4030-9402-a8ff0adf64c6
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1)
IwConfig:
 lo        no wireless extensions.

 eth0      no wireless extensions.
MachineType: Gigabyte Technology Co., Ltd. To be filled by O.E.M.
MarkForUpload: True
ProcEnviron:
 TERM=xterm-color
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcFB: 0 VESA VGA
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-63-generic root=UUID=45c2a972-2497-11e2-88ea-50e549361dd3 ro quiet splash vt.handoff=7
PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon.
RelatedPackageVersions:
 linux-restricted-modules-3.2.0-63-generic N/A
 linux-backports-modules-3.2.0-63-generic  N/A
 linux-firmware                            1.79.14
RfKill:
 0: hci0: Bluetooth
  Soft blocked: yes
  Hard blocked: no
SourcePackage: linux
UpgradeStatus: Upgraded to precise on 2012-05-06 (745 days ago)
dmi.bios.date: 01/28/2013
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: FC
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: 970A-UD3
dmi.board.vendor: Gigabyte Technology Co., Ltd.
dmi.board.version: x.x
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
dmi.chassis.version: To Be Filled By O.E.M.
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrFC:bd01/28/2013:svnGigabyteTechnologyCo.,Ltd.:pnTobefilledbyO.E.M.:pvrTobefilledbyO.E.M.:rvnGigabyteTechnologyCo.,Ltd.:rn970A-UD3:rvrx.x:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvrToBeFilledByO.E.M.:
dmi.product.name: To be filled by O.E.M.
dmi.product.version: To be filled by O.E.M.
dmi.sys.vendor: Gigabyte Technology Co., Ltd.

** Affects: linux (Ubuntu)
     Importance: Low
         Status: Incomplete


** Tags: amd64 apport-bug latest-bios-fc precise utopic
-- 
[Gigabyte GA-970A-UD3 (rev. 3.0)] Ubuntu 12.04 LTS lshw sees 12gb RAM but system only using 8gb
https://bugs.launchpad.net/bugs/1321938
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