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Thread: 6 GB RAM is installed, but only 2 GB appears

  1. #1
    Join Date
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    Ubuntu

    6 GB RAM is installed, but only 2 GB appears

    Hi.
    I have a weird problem.
    My computer has 6 GB of RAM, but when I turn it on only 1.7 GB of RAM is available. If I run lshw, I can see that the all the RAM is installed. If I restart the system a few times, all the RAM is recognized properly.
    Does anyone know the reason for this behavior?

    free -m
    Code:
                 total       used       free     shared    buffers     cached
    Mem:          1723        690       1033          0         78        231
    -/+ buffers/cache:        381       1342
    Swap:         9443          0       9443

    sudo lshw -class memory
    Code:
      *-firmware              
           descrição: BIOS
           fabricante: American Megatrends Inc.
           physical id: 0
           versão: P1.40
           date: 12/04/2012
           tamanho: 64KiB
           capacidade: 4032KiB
           capabilities: pci upgrade shadowing cdboot bootselect socketedrom edd int13floppy1200 int13floppy720 int13floppy2880 int5printscreen int9keyboard int14serial int17printer acpi usb biosbootspecification
      *-memory
           descrição: Memória do sistema
           physical id: 8
           slot: Placa do sistema ou placa-mãe
           tamanho: 6GiB
         *-bank:0
              descrição: DIMM DDR3 Síncrono 1333 MHz (0,8 ns)
              produto: 9905471-006.A00LF
              fabricante: Kingston
              physical id: 0
              serial: 65206C13
              slot: A1_DIMM0
              tamanho: 4GiB
              largura: 64 bits
              clock: 1333MHz (0.8ns)
         *-bank:1
              descrição: DIMM DDR3 Síncrono 1333 MHz (0,8 ns)
              produto: 9905402-179.A00LF
              fabricante: Kingston
              physical id: 1
              serial: 7E13B005
              slot: A1_DIMM1
              tamanho: 2GiB
              largura: 64 bits
              clock: 1333MHz (0.8ns)
      *-cache:0
           descrição: L1 cache
           physical id: f
           slot: L1 CACHE
           tamanho: 384KiB
           capacidade: 384KiB
           clock: 1GHz (1.0ns)
           capabilities: pipeline-burst internal write-back unified
      *-cache:1
           descrição: L2 cache
           physical id: 10
           slot: L2 CACHE
           tamanho: 3MiB
           capacidade: 3MiB
           clock: 1GHz (1.0ns)
           capabilities: pipeline-burst internal write-back unified
    uname -a
    Code:
    Linux Principal-sala 3.2.0-36-generic #57-Ubuntu SMP Tue Jan 8 21:44:52 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux

  2. #2
    Join Date
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    Re: 6 GB RAM is installed, but only 2 GB appears

    So sometimes, after several reboots, all the memory will be grabbed by Ubuntu!

    - Could it be a bad connection? Move the RAM cards a little, pull out and push in again and check if it helps.

    - Check if you get some error with memtest (that you can start from the grub menu at boot). Run it for a long time, overnight if possible, to catch an error that might show up only once in a while. I suggest that you reboot until your computer (and memtest) will grab all the RAM.

  3. #3
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    Kubuntu 14.04 Trusty Tahr

    Re: 6 GB RAM is installed, but only 2 GB appears

    It doesn't look like you're using the 64-bit version of the kernel. The 32-bit version cannot address all six gigabytes unless you have the -pae kernel installed, which uname does not report either.

    Try booting from a 64-bit installation CD and run "Try Ubuntu". When it finishes loading, run free again. If you see all your memory, then you should consider upgrading to the 64-bit version.
    If you ask for help, please have the courtesy to check for responses and thank the people who helped you.

    Blog · Linode System Administration Guides · Android Apps for Ubuntu Users

  4. #4
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    Re: 6 GB RAM is installed, but only 2 GB appears

    Quote Originally Posted by SeijiSensei View Post
    It doesn't look like you're using the 64-bit version of the kernel. The 32-bit version cannot address all six gigabytes unless you have the -pae kernel installed, which uname does not report either.

    Try booting from a 64-bit installation CD and run "Try Ubuntu". When it finishes loading, run free again. If you see all your memory, then you should consider upgrading to the 64-bit version.
    But in post #1 [s]he wrote

    uname -a

    Code:
    Linux Principal-sala 3.2.0-36-generic #57-Ubuntu SMP Tue Jan 8 21:44:52 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux
    which indicates a 64-bit kernel (x86_64)

  5. #5
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    Re: 6 GB RAM is installed, but only 2 GB appears

    Sorry, I guess I didn't scroll right far enough.
    If you ask for help, please have the courtesy to check for responses and thank the people who helped you.

    Blog · Linode System Administration Guides · Android Apps for Ubuntu Users

  6. #6
    Join Date
    Dec 2007
    Beans
    10

    Re: 6 GB RAM is installed, but only 2 GB appears

    Given that you have to restart a few times to have it detected properly...

    Do this: Pay attention to the BIOS memory check screen, and see if it's detected properly there. To make the BIOS screen stay longer, turn off quick memory check. If yes, run Memtest86 whenever you notice the BIOS detecting less RAM than installed.

    If no, then I'd suspect either RAM not seated properly, bad RAM, or (sometimes) PSU too weak to drive that many bars of RAM.

    If yes, however, it may be a quirk with the firmware. Try upgrading your firmware and see if the problem goes away.

  7. #7
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    Re: 6 GB RAM is installed, but only 2 GB appears

    Hi Tuberculo!

    I have seen similar situation, and the problem was the sequence of
    the memory on the banks, but for this I would recommend you to take a
    look at the motherboard manual. if the memory are not placed correct
    it can result on bad work.

    Eu ja vi algo semelhante a isto e o problema era a sequencia que as
    memorias estavam colocadas nos bancos, da uma olhada no site do
    fabricante do seu computador na maioria das vezes tem um manual la
    com as espicifações. num server que eu estou virando uma versao do
    Ubuntu elas estao colocadas com espacos vazios geralmente este bancos
    estao diferenciados com cores dois bancos pretos e dois brancos e se v
    oce olhar as cores não estão juntas..



    Boa sorte
    Good luck.

    Abraços.

    João

  8. #8
    Join Date
    Jul 2012
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    317
    Distro
    Ubuntu 12.04 Precise Pangolin

    Re: 6 GB RAM is installed, but only 2 GB appears

    Hello,

    I had the same problem, only with 4GB. For some reason it would only recognize 2 of the 4. I turned the computer off, unplugged the system, took out the RAM and then put them back in. However, if you have a mixed number like 1*2GB and 1*GB, put the biggest RAM in the first slot.

    I say you should definitely consult the manual to your motherboard like Joao Lacerda suggested. Something could be wrong with how they are in or with your BIOS setup. The last thing it could be is that something is wrong with the RAM itself, not with the BIOS or the computer/Ubuntu. I have also read that letting your computer sit for about 5 minutes off with nothing plugged in (PSU) with the RAM out sort of resets it, so you could try that too.

  9. #9
    Join Date
    Jun 2007
    Beans
    11,021

    Re: 6 GB RAM is installed, but only 2 GB appears

    What kind of motherboard is it? Look at this if not sure:
    Code:
    sudo dmidecode
    It's always best to use RAM on the mobo vendor's list (though this is not always feasible) and use RAM in matched pairs.

  10. #10
    Join Date
    Jun 2006
    Location
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    Ubuntu

    Re: 6 GB RAM is installed, but only 2 GB appears

    Thanks for all the replies.
    I have already tried memtest, but I did not run it for a long time, I'll try that later.
    If I want, I always manage to have 6 GB of RAM, but I have to reboot a few times. That's annoying. I think the problem may be in Ubuntu because, in BIOS, all the memory is recognized every time. The command lshw also recognizes 6 GB.
    My motherboard is A55M-HVS. There are only two banks. I have already switched positions, with no result. I also tried BIOS update.
    I will try Lightning Dragon's idea later.

    dmidecode:
    Code:
    # dmidecode 2.11
    SMBIOS 2.7 present.
    19 structures occupying 1146 bytes.
    Table at 0x000E9690.
    
    Handle 0x0000, DMI type 0, 24 bytes
    BIOS Information
    	Vendor: American Megatrends Inc.
    	Version: P1.40
    	Release Date: 12/04/2012
    	Address: 0xF0000
    	Runtime Size: 64 kB
    	ROM Size: 4096 kB
    	Characteristics:
    		PCI is supported
    		BIOS is upgradeable
    		BIOS shadowing is allowed
    		Boot from CD is supported
    		Selectable boot is supported
    		BIOS ROM is socketed
    		EDD is supported
    		5.25"/1.2 MB floppy services are supported (int 13h)
    		3.5"/720 kB floppy services are supported (int 13h)
    		3.5"/2.88 MB floppy services are supported (int 13h)
    		Print screen service is supported (int 5h)
    		8042 keyboard services are supported (int 9h)
    		Serial services are supported (int 14h)
    		Printer services are supported (int 17h)
    		ACPI is supported
    		USB legacy is supported
    		BIOS boot specification is supported
    		Targeted content distribution is supported
    		UEFI is supported
    	BIOS Revision: 4.6
    
    Handle 0x0001, DMI type 1, 27 bytes
    System Information
    	Manufacturer: To Be Filled By O.E.M.
    	Product Name: To Be Filled By O.E.M.
    	Version: To Be Filled By O.E.M.
    	Serial Number: To Be Filled By O.E.M.
    	UUID: 03000200-0400-0500-0006-000700080009
    	Wake-up Type: Power Switch
    	SKU Number: To Be Filled By O.E.M.
    	Family: To Be Filled By O.E.M.
    
    Handle 0x0002, DMI type 2, 15 bytes
    Base Board Information
    	Manufacturer: ASRock
    	Product Name: A55M-HVS
    	Version:                       
    	Serial Number:                       
    	Asset Tag:                       
    	Features:
    		Board is a hosting board
    		Board is replaceable
    	Location In Chassis:                       
    	Chassis Handle: 0x0003
    	Type: Motherboard
    	Contained Object Handles: 0
    
    Handle 0x0003, DMI type 3, 22 bytes
    Chassis Information
    	Manufacturer: To Be Filled By O.E.M.
    	Type: Desktop
    	Lock: Not Present
    	Version: To Be Filled By O.E.M.
    	Serial Number: To Be Filled By O.E.M.
    	Asset Tag: To Be Filled By O.E.M.
    	Boot-up State: Safe
    	Power Supply State: Safe
    	Thermal State: Safe
    	Security Status: None
    	OEM Information: 0x00000000
    	Height: Unspecified
    	Number Of Power Cords: 1
    	Contained Elements: 0
    	SKU Number: To be filled by O.E.M.
    
    Handle 0x0004, DMI type 9, 17 bytes
    System Slot Information
    	Designation: PCI1
    	Type: 32-bit PCI
    	Current Usage: In Use
    	Length: Short
    	ID: 1
    	Characteristics:
    		3.3 V is provided
    		Opening is shared
    		PME signal is supported
    
    Handle 0x0005, DMI type 9, 17 bytes
    System Slot Information
    	Designation: PCIE2
    	Type: x16 PCI Express
    	Current Usage: In Use
    	Length: Short
    	ID: 17
    	Characteristics:
    		3.3 V is provided
    		Opening is shared
    		PME signal is supported
    	Bus Address: 0000:00:02.0
    
    Handle 0x0006, DMI type 9, 17 bytes
    System Slot Information
    	Designation: PCIE3
    	Type: x4 PCI Express
    	Current Usage: In Use
    	Length: Short
    	ID: 18
    	Characteristics:
    		3.3 V is provided
    		Opening is shared
    		PME signal is supported
    	Bus Address: 0000:00:04.0
    
    Handle 0x0007, DMI type 11, 5 bytes
    OEM Strings
    	String 1: To Be Filled By O.E.M.
    
    Handle 0x0008, DMI type 16, 23 bytes
    Physical Memory Array
    	Location: System Board Or Motherboard
    	Use: System Memory
    	Error Correction Type: None
    	Maximum Capacity: 6 GB
    	Error Information Handle: Not Provided
    	Number Of Devices: 2
    
    Handle 0x0009, DMI type 19, 31 bytes
    Memory Array Mapped Address
    	Starting Address: 0x00000000000
    	Ending Address: 0x0017FFFFFFF
    	Range Size: 6 GB
    	Physical Array Handle: 0x0008
    	Partition Width: 255
    
    Handle 0x000A, DMI type 17, 34 bytes
    Memory Device
    	Array Handle: 0x0008
    	Error Information Handle: Not Provided
    	Total Width: 64 bits
    	Data Width: 64 bits
    	Size: 4096 MB
    	Form Factor: DIMM
    	Set: None
    	Locator: A1_DIMM0
    	Bank Locator: A1_BANK0
    	Type: DDR3
    	Type Detail: Synchronous
    	Speed: 1333 MHz
    	Manufacturer: Kingston        
    	Serial Number: 65206C13  
    	Asset Tag: A1_AssetTagNum0
    	Part Number: 9905471-006.A00LF 
    	Rank: 2
    	Configured Clock Speed: 533 MHz
    
    Handle 0x000B, DMI type 20, 35 bytes
    Memory Device Mapped Address
    	Starting Address: 0x00000000000
    	Ending Address: 0x000FFFFFFFF
    	Range Size: 4 GB
    	Physical Device Handle: 0x000A
    	Memory Array Mapped Address Handle: 0x0009
    	Partition Row Position: 1
    
    Handle 0x000C, DMI type 17, 34 bytes
    Memory Device
    	Array Handle: 0x0008
    	Error Information Handle: Not Provided
    	Total Width: 64 bits
    	Data Width: 64 bits
    	Size: 2048 MB
    	Form Factor: DIMM
    	Set: None
    	Locator: A1_DIMM1
    	Bank Locator: A1_BANK1
    	Type: DDR3
    	Type Detail: Synchronous
    	Speed: 1333 MHz
    	Manufacturer: Kingston        
    	Serial Number: 7E13B005  
    	Asset Tag: A1_AssetTagNum1
    	Part Number: 9905402-179.A00LF 
    	Rank: 1
    	Configured Clock Speed: 533 MHz
    
    Handle 0x000D, DMI type 20, 35 bytes
    Memory Device Mapped Address
    	Starting Address: 0x00100000000
    	Ending Address: 0x0017FFFFFFF
    	Range Size: 2 GB
    	Physical Device Handle: 0x000C
    	Memory Array Mapped Address Handle: 0x0009
    	Partition Row Position: 1
    
    Handle 0x000E, DMI type 32, 20 bytes
    System Boot Information
    	Status: No errors detected
    
    Handle 0x000F, DMI type 7, 19 bytes
    Cache Information
    	Socket Designation: L1 CACHE
    	Configuration: Enabled, Not Socketed, Level 1
    	Operational Mode: Write Back
    	Location: Internal
    	Installed Size: 384 kB
    	Maximum Size: 384 kB
    	Supported SRAM Types:
    		Pipeline Burst
    	Installed SRAM Type: Pipeline Burst
    	Speed: 1 ns
    	Error Correction Type: Multi-bit ECC
    	System Type: Unified
    	Associativity: 2-way Set-associative
    
    Handle 0x0010, DMI type 7, 19 bytes
    Cache Information
    	Socket Designation: L2 CACHE
    	Configuration: Enabled, Not Socketed, Level 2
    	Operational Mode: Write Back
    	Location: Internal
    	Installed Size: 3072 kB
    	Maximum Size: 3072 kB
    	Supported SRAM Types:
    		Pipeline Burst
    	Installed SRAM Type: Pipeline Burst
    	Speed: 1 ns
    	Error Correction Type: Multi-bit ECC
    	System Type: Unified
    	Associativity: 16-way Set-associative
    
    Handle 0x0012, DMI type 4, 42 bytes
    Processor Information
    	Socket Designation: CPUSocket
    	Type: Central Processor
    	Family: S-Series
    	Manufacturer: AMD
    	ID: 10 0F 30 00 FF FB 8B 17
    	Signature: Family 18, Model 1, Stepping 0
    	Flags:
    		FPU (Floating-point unit on-chip)
    		VME (Virtual mode extension)
    		DE (Debugging extension)
    		PSE (Page size extension)
    		TSC (Time stamp counter)
    		MSR (Model specific registers)
    		PAE (Physical address extension)
    		MCE (Machine check exception)
    		CX8 (CMPXCHG8 instruction supported)
    		APIC (On-chip APIC hardware supported)
    		SEP (Fast system call)
    		MTRR (Memory type range registers)
    		PGE (Page global enable)
    		MCA (Machine check architecture)
    		CMOV (Conditional move instruction supported)
    		PAT (Page attribute table)
    		PSE-36 (36-bit page size extension)
    		CLFSH (CLFLUSH instruction supported)
    		MMX (MMX technology supported)
    		FXSR (FXSAVE and FXSTOR instructions supported)
    		SSE (Streaming SIMD extensions)
    		SSE2 (Streaming SIMD extensions 2)
    		HTT (Multi-threading)
    	Version: AMD A6-3500 APU with Radeon(tm) HD Graphics
    	Voltage: 1.4 V
    	External Clock: 100 MHz
    	Max Speed: 2100 MHz
    	Current Speed: 2100 MHz
    	Status: Populated, Enabled
    	Upgrade: Socket FM1
    	L1 Cache Handle: 0x000F
    	L2 Cache Handle: 0x0010
    	L3 Cache Handle: Not Provided
    	Serial Number: Not Specified
    	Asset Tag: Not Specified
    	Part Number: Not Specified
    	Core Count: 3
    	Core Enabled: 3
    	Thread Count: 3
    	Characteristics:
    		64-bit capable
    
    Handle 0x0013, DMI type 127, 4 bytes
    End Of Table

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