LinuxQuestions.org
Help answer threads with 0 replies.
Go Back   LinuxQuestions.org > Forums > Linux Forums > Linux - Newbie
User Name
Password
Linux - Newbie This Linux forum is for members that are new to Linux.
Just starting out and have a question? If it is not in the man pages or the how-to's this is the place!

Notices


Reply
  Search this Thread
Old 08-11-2008, 06:04 AM   #1
your_shadow03
Senior Member
 
Registered: Jun 2008
Location: Germany
Distribution: Slackware
Posts: 1,461
Blog Entries: 6

Rep: Reputation: 51
How Much Maximum RAM I have?


Can anyone trace out what is the maximum RAM I have through this command:
#dmidecode

Code:
       System Type: Unknown
                Associativity: 4-way Set-associative
Handle 0x0714
        DMI type 7, 19 bytes.
        Cache Information
                Socket Designation: Node 2 Internal L1 Cache
                Configuration: Enabled, Not Socketed, Level 1
                Operational Mode: Write Back
                Location: Internal
                Installed Size: 64 KB
                Maximum Size: 64 KB
                Supported SRAM Types:
                        Burst
                Installed SRAM Type: Burst
                Speed: Unknown
                Error Correction Type: Unknown
                System Type: Unknown
                Associativity: 4-way Set-associative
Handle 0x0726
        DMI type 7, 19 bytes.
        Cache Information
                Socket Designation: Node 1 Internal L2 Cache
                Configuration: Enabled, Not Socketed, Level 2
                Operational Mode: Varies With Memory Address
                Location: Internal
                Installed Size: 1024 KB
                Maximum Size: 2048 KB
                Supported SRAM Types:
                        Burst
                Installed SRAM Type: Burst
                Speed: Unknown
                Error Correction Type: Unknown
                System Type: Unknown
                Associativity: 4-way Set-associative
Handle 0x0724
        DMI type 7, 19 bytes.
        Cache Information
                Socket Designation: Node 2 Internal L2 Cache
                Configuration: Enabled, Not Socketed, Level 2
                Operational Mode: Varies With Memory Address
                Location: Internal
                Installed Size: 1024 KB
                Maximum Size: 2048 KB
                Supported SRAM Types:
                        Burst
                Installed SRAM Type: Burst
                Speed: Unknown
                Error Correction Type: Unknown
                System Type: Unknown
                Associativity: 4-way Set-associative
Handle 0x0736
        DMI type 7, 19 bytes.
        Cache Information
                Socket Designation: Node 1 Internal L3 Cache
                Configuration: Disabled, Not Socketed, Level 3
                Operational Mode: Unknown
                Location: Internal
                Installed Size: 0 KB
                Maximum Size: 1024 KB
                Supported SRAM Types:
                        Burst
                Installed SRAM Type: Burst
                Speed: Unknown
                Error Correction Type: Unknown
                System Type: Unknown
                Associativity: 4-way Set-associative
Handle 0x0734
        DMI type 7, 19 bytes.
        Cache Information
                Socket Designation: Node 2 Internal L3 Cache
                Configuration: Disabled, Not Socketed, Level 3
                Operational Mode: Unknown
                Location: Internal
                Installed Size: 0 KB
                Maximum Size: 1024 KB
                Supported SRAM Types:
                        Burst
                Installed SRAM Type: Burst
                Speed: Unknown
                Error Correction Type: Unknown
                System Type: Unknown
                Associativity: 4-way Set-associative
Handle 0x0801
        DMI type 8, 9 bytes.
        Port Connector Information
                Internal Reference Designator: J508
                Internal Connector Type: Access Bus (USB)
                External Reference Designator: USB Port 1
                External Connector Type: Access Bus (USB)
                Port Type: USB
Handle 0x0802
        DMI type 8, 9 bytes.
        Port Connector Information
                Internal Reference Designator: J24
                Internal Connector Type: Access Bus (USB)
                External Reference Designator: USB Port 2
                External Connector Type: Access Bus (USB)
                Port Type: USB
Handle 0x0803
        DMI type 8, 9 bytes.
        Port Connector Information
                Internal Reference Designator: J24
                Internal Connector Type: Access Bus (USB)
                External Reference Designator: USB Port 3
                External Connector Type: Access Bus (USB)
                Port Type: USB
Handle 0x0901
        DMI type 9, 13 bytes.
        System Slot Information
                Designation: PCI Slot 1
                Type: 64-bit PCI-X
                Current Usage: In Use
                Length: Long
                ID: 1
                Characteristics:
                        3.3 V is provided
Handle 0x0902
        DMI type 9, 13 bytes.
        System Slot Information
                Designation: PCI Slot 2
                Type: 64-bit PCI-X
                Current Usage: In Use
                Length: Long
                ID: 2
                Characteristics:
                        3.3 V is provided
Handle 0x0903
        DMI type 9, 13 bytes.
        System Slot Information
                Designation: PCI Slot 3
                Type: 64-bit PCI-X
                Current Usage: Available
                Length: Long
                ID: 3
                Characteristics:
                        3.3 V is provided
Handle 0x0B00
        DMI type 11, 5 bytes.
        OEM Strings
                String 1: Product ID: 373545-421
Handle 0x1000
        DMI type 16, 15 bytes.
        Physical Memory Array
                Location: System Board Or Motherboard
                Use: System Memory
                Error Correction Type: Single-bit ECC
                Maximum Capacity: 32 GB
                Error Information Handle: Not Provided
                Number Of Devices: 8
Handle 0x1100
        DMI type 17, 23 bytes.
        Memory Device
                Array Handle: 0x1000
                Error Information Handle: Not Provided
                Total Width: 72 bits
                Data Width: 64 bits
                Size: 512 MB
                Form Factor: DIMM
                Set: 1
                Locator: DIMM 01
                Bank Locator: Not Specified
                Type: DDR
                Type Detail: Synchronous
                Speed: 400 MHz (2.5 ns)
Handle 0x1101
        DMI type 17, 23 bytes.
        Memory Device
                Array Handle: 0x1000
                Error Information Handle: Not Provided
                Total Width: 72 bits
                Data Width: 64 bits
                Size: 512 MB
                Form Factor: DIMM
                Set: 1
                Locator: DIMM 02
                Bank Locator: Not Specified
                Type: DDR
                Type Detail: Synchronous
                Speed: 400 MHz (2.5 ns)
Handle 0x1102
        DMI type 17, 23 bytes.
        Memory Device
                Array Handle: 0x1000
                Error Information Handle: Not Provided
                Total Width: 72 bits
                Data Width: 64 bits
                Size: 512 MB
                Form Factor: DIMM
                Set: 2
                Locator: DIMM 03
                Bank Locator: Not Specified
                Type: DDR
                Type Detail: Synchronous
                Speed: 400 MHz (2.5 ns)
Handle 0x1103
        DMI type 17, 23 bytes.
        Memory Device
                Array Handle: 0x1000
                Error Information Handle: Not Provided
                Total Width: 72 bits
                Data Width: 64 bits
                Size: 512 MB
                Form Factor: DIMM
                Set: 2
                Locator: DIMM 04
                Bank Locator: Not Specified
                Type: DDR
                Type Detail: Synchronous
                Speed: 400 MHz (2.5 ns)
Handle 0x1104
        DMI type 17, 23 bytes.
        Memory Device
                Array Handle: 0x1000
                Error Information Handle: Not Provided
                Total Width: 72 bits
                Data Width: 64 bits
                Size: 512 MB
                Form Factor: DIMM
                Set: 3
                Locator: DIMM 05
                Bank Locator: Not Specified
?
 
Old 08-11-2008, 06:11 AM   #2
timmeke
Senior Member
 
Registered: Nov 2005
Location: Belgium
Distribution: Red Hat, Fedora
Posts: 1,515

Rep: Reputation: 61
I'm assuming you're talking about the working RAM, not the CPU cache memory (L1/L2/L3).

You seem to have at least 2.5GB physical RAM installed, in DIMMS of 512MB each.
Your motherboard's array allows up to 32 GB.
Quote:
Physical Memory Array
Location: System Board Or Motherboard
Use: System Memory
Error Correction Type: Single-bit ECC
Maximum Capacity: 32 GB
Error Information Handle: Not Provided
Number Of Devices: 8
Note that, to access memory > 3GB, you'll need a 64-bit platform (kernel).
 
Old 08-11-2008, 06:19 AM   #3
pixellany
LQ Veteran
 
Registered: Nov 2005
Location: Annapolis, MD
Distribution: Arch/XFCE
Posts: 17,802

Rep: Reputation: 738Reputation: 738Reputation: 738Reputation: 738Reputation: 738Reputation: 738Reputation: 738
Relevant parts of dmidecode from my system:
Code:
Memory Controller Information
        Error Detecting Method: None
        Error Correcting Capabilities:
                None
        Supported Interleave: Four-way Interleave
        Current Interleave: Four-way Interleave
        Maximum Memory Module Size: 1024 MB
        Maximum Total Memory Size: 4096 MB
        Supported Speeds:
                Other
        Supported Memory Types:
                Other
                DIMM
                SDRAM
        Memory Module Voltage: 3.3 V
        Associated Memory Slots: 4
                0x0006
                0x0007
                0x0008
                0x0009
        Enabled Error Correcting Capabilities: None

Handle 0x0006, DMI type 6, 12 bytes
Memory Module Information
        Socket Designation: DIMM1
        Bank Connections: 0 1
        Current Speed: 60 ns
        Type: Other DIMM SDRAM
        Installed Size: 512 MB (Double-bank Connection)
        Enabled Size: 512 MB (Double-bank Connection)
        Error Status: OK
(there's another entry--DIMM2--showing my other 512K
 
Old 08-11-2008, 06:31 AM   #4
syg00
LQ Veteran
 
Registered: Aug 2003
Location: Australia
Distribution: Lots ...
Posts: 14,839

Rep: Reputation: 1822Reputation: 1822Reputation: 1822Reputation: 1822Reputation: 1822Reputation: 1822Reputation: 1822Reputation: 1822Reputation: 1822Reputation: 1822Reputation: 1822
Quote:
Originally Posted by timmeke View Post
Note that, to access memory > 3GB, you'll need a 64-bit platform (kernel).
Not true.
A PAE kernel will allow access to all the memory this motherboard supports. 32-bit kernels are restricted to a 4 Gig (virtual) address space - of which userspace can typically only access 3 Gig (on x86). Again, this is virtual addressing limit, not physical RAM. Also, there exists schemes to redress this.

A 64-bit environment (if applicable) will alleviate most memory addressing issues.
 
Old 08-11-2008, 06:34 AM   #5
your_shadow03
Senior Member
 
Registered: Jun 2008
Location: Germany
Distribution: Slackware
Posts: 1,461
Blog Entries: 6

Original Poster
Rep: Reputation: 51
If its 2.5 GB installed what this Output means:


Code:
node2# free -m
             total       used       free     shared    buffers     cached
Mem:          3862        148       3713          0         15         90
-/+ buffers/cache:         42       3819
Swap:         4095          0       4095
does it says 3862MB is the total memory.
 
Old 08-11-2008, 06:59 AM   #6
pixellany
LQ Veteran
 
Registered: Nov 2005
Location: Annapolis, MD
Distribution: Arch/XFCE
Posts: 17,802

Rep: Reputation: 738Reputation: 738Reputation: 738Reputation: 738Reputation: 738Reputation: 738Reputation: 738
Quote:
Originally Posted by your_shadow03 View Post
does it says 3862MB is the total memory.
That's what it says...how much do you actually have? (e.g. how much does the BIOS see when you boot up?)
 
Old 08-11-2008, 08:11 AM   #7
your_shadow03
Senior Member
 
Registered: Jun 2008
Location: Germany
Distribution: Slackware
Posts: 1,461
Blog Entries: 6

Original Poster
Rep: Reputation: 51
Code:
You seem to have at least 2.5GB physical RAM installed, in DIMMS of 512MB each. 
Your motherboard's array allows up to 32 GB.
But it indicates 3.77GB and not 2.5GB physical memory as stated above.
 
Old 08-11-2008, 08:30 AM   #8
timmeke
Senior Member
 
Registered: Nov 2005
Location: Belgium
Distribution: Red Hat, Fedora
Posts: 1,515

Rep: Reputation: 61
@syg00: True, but is PAE not limited to certain types of processors only?

@your_shadow03: 3.77GB (or rather, 4GB if you include swap) is the total.
From your posted output, I could see only 5 DIMMs of 512MB each listed (rather than 8), hence
my quick total of *AT LEAST* 2.5GB. But as this is a somewhat uncommon amount, I was thinking
that it's probably more and you just forgot to post a part of the output.

To repeat pixellany's question: what does your BIOS say about the amount of physical RAM?
To check this: reboot the machine, press the special key (F2, F12,...) that is indicated at the
very beginning to open BIOS. Don't change anything there, just look up the amount of memory and
then exit (without saving changes).
 
Old 08-11-2008, 08:55 AM   #9
syg00
LQ Veteran
 
Registered: Aug 2003
Location: Australia
Distribution: Lots ...
Posts: 14,839

Rep: Reputation: 1822Reputation: 1822Reputation: 1822Reputation: 1822Reputation: 1822Reputation: 1822Reputation: 1822Reputation: 1822Reputation: 1822Reputation: 1822Reputation: 1822
Quote:
Originally Posted by timmeke View Post
but is PAE not limited to certain types of processors only?
Intel x86 - everything since the Pentium Pro I'd reckon. Couldn't say for AMD.
 
Old 08-17-2008, 12:47 AM   #10
/usr/darien
Member
 
Registered: Mar 2008
Location: Virginia
Distribution: RHEL 4/5, Fedora 6-9, SuSE 10.1-11, Open Solaris 10.8, WinXP,2003,Vista
Posts: 59

Rep: Reputation: 15
Quote:
Originally Posted by your_shadow03 View Post
Code:
You seem to have at least 2.5GB physical RAM installed, in DIMMS of 512MB each. 
Your motherboard's array allows up to 32 GB.
But it indicates 3.77GB and not 2.5GB physical memory as stated above.
The key words are “at least” meaning that you have 2.5GB or more.
 
Old 08-17-2008, 05:51 AM   #11
arizonagroovejet
Senior Member
 
Registered: Jun 2005
Location: England
Distribution: openSUSE, Fedora, CentOS
Posts: 1,078

Rep: Reputation: 195Reputation: 195
There are much better ways to find out how much ram you have that dmidecode. The best of course being look in the BIOS as people have suggested. Also

Code:
$ cat /proc/meminfo
If you have it try the lshw command. If you don't have it it's probably in your distro's repos. Or run top and look what it says next to Mem:
 
  


Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is Off
HTML code is Off



Similar Threads
Thread Thread Starter Forum Replies Last Post
Wondering: How much ram can be used on AMD64? I mean, the maximum. szofiel Linux - Laptop and Netbook 9 07-14-2008 04:44 PM
How many is the maximum of ram that supports Fedora 7 ?? sinyobat Fedora 1 09-10-2007 01:43 PM
MB Maximum RAM Capacity Question Linux31 Linux - Hardware 7 08-11-2007 10:23 AM
Win98SE Pentium166MMX/64MB RAM vs Linux AthlonXP+ 3000/512MB RAM : Lucent LT WinModem t3gah Linux - Software 2 04-22-2005 02:01 PM
Maximum RAM with Intel CPU ghight Linux - Hardware 5 03-02-2003 04:48 PM


All times are GMT -5. The time now is 06:36 AM.

Main Menu
Advertisement
My LQ
Write for LQ
LinuxQuestions.org is looking for people interested in writing Editorials, Articles, Reviews, and more. If you'd like to contribute content, let us know.
Main Menu
Syndicate
RSS1  Latest Threads
RSS1  LQ News
Twitter: @linuxquestions
Facebook: linuxquestions Google+: linuxquestions
Open Source Consulting | Domain Registration