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I have 4gb physical memory and xp sp3 showing only 3gb

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You have a 32 bit computer. The address space in a 32 bit computer can only take a max of 4GB of RAM but the operating system will only report less than the total amount of memory in the PC. See the below link for more information.
http://msdn.microsoft.com/en-us/library/aa366778.aspx

Posted on Nov 26, 2008

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BIOS says 3GB RAM, Properties says 2GB RAM


You may want to flash your bios on the motherboard if there is an update. Windows XP Pro will support up to 4GB of RAM.

Feb 20, 2013 | Microsoft Windows XP Professional

Tip

Mamimum RAM for User @ 3GB using boot.ini switch on 4GB Physical RAM


The DOS will always take a percentage of the physical RAM on the motherboard leaving the rest for the User. By default the Windows Operating System will use 50% of the physical RAM installed on the motherboard leaving the user the remaining 50% this can be changed using a switch in the boot.ini file

The /3GB was originally meant to be used in systems that have 3GB or more of RAM something that is no longer quite as rare as it used to be Windows XP SP3 will support upto 4GB although on a 32bit (x86) version of Windows will acually see 3.25gb that is the limitation.

However, even if you don't have 3 GB or more of memory, you can still use the /3GB switch. the switch can have any value between 2048 (2 GB) and 3072 (3 GB) megabytes. It needs to be expressed in decimal notation.

The /3GB switch applies to 32-bit systems only (x86).

Example with Windows XP SP3 Home Edition with the recovery console installed this gives you the option of default 50-50% split or the 3GB switch 75-25% split.

The /noexecute parameter enables, disables, and configures Data Execution Prevention (DEP), a set of hardware and software technologies designed to prevent harmful code from running in protected memory locations using the optin switch enables DEP only for operating system components, including the Windows kernel and drivers. Administrators can enable DEP on selected executable files by using the Application Compatibility Toolkit (ACT).

The /burnmemory parameter specifies the amount of memory, in megabytes, that Windows cannot use in this example, /burnmemory=128 will reduce the physical RAM memory that is available to Windows by 128 MB.

[boot loader]
timeout=10
default=multi(0)disk(0)rdisk(0)partition(1)WINDOWS
[operating systems]
multi(0)disk(0)rdisk(0)partition(1)WINDOWS="Microsoft Windows XP Home Edition 3GB Switch" /noexecute=optin /3GB /fastdetect
multi(0)disk(0)rdisk(0)partition(1)WINDOWS="Microsoft Windows XP Home Edition " /noexecute=optin /burnmemory=128 /fastdetect
C:CMDCONSBOOTSECT.DAT="Microsoft Windows Recovery Console" /cmdcons


Check out the noexecute and the 3GB switch plus all available boot.ini switches HERE

I suggest that you use AnalogX MaxMem it is a realtime physical memory management program that automatically ensures that you always have as much physical memory available as possible used with the 3GB switch you should never have memory issues ever again.



on Mar 14, 2010 | Microsoft Windows XP Home Edition for PC

2 Answers

Windows xp professional service pack 3 intel pentiun p 6200 2.13ghz ram 3gb cant launch gta 4 erorr 0xc00001325


Hi,

May be its problem on service pack 3 installation. please uninstall sp3 and again install.

Aug 08, 2011 | Operating Systems

1 Answer

Windows xp pro, how much ram can be seen by it?


It supports 4GB of RAM however the virtual address space of processes and applications is still limited to 2 GB unless the /3GB switch is used in the Boot.ini file

You can find more about it and how to set it up to 3GB on Microsoft website:
http://www.microsoft.com/whdc/system/platform/server/pae/paemem.mspx

Feb 06, 2011 | Microsoft Windows XP Professional for PC

1 Answer

I have windows xp 64bit and iam trying to use 2 slots of 2gb memory ddr2 and instead of 4gb memory iam getting as a result 2.43gb how can i solve this? i have an asus pb5


It looks a little low - but two possiblilites... the motherboard's chipset does not support more than 3GB of ram or you have not configured your ram correctly in your BIOS setup.

Restart computer and press whichever key it asks you to so you can go to Setup or BIOS config.

Look in the memory section, advanced chip set section or if necessary just go through all the options until you see the map memory hole... this allows the BIOS to see more memory.

But I think you will find it is your chipset. You could try flashing the BIOS to the latest version --- but that's another story.

Oct 02, 2009 | Microsoft Windows XP Professional SP2C for...

1 Answer

Windows explorer not initiated at startup and hangs the system,


I had this XP problem with Norton recent after SP3 got on.
Clean install and no antivirus, straight afterwards a bootable CD with SP3 then I replace already removed Norton with Avast virus scanner.
Superfast, all problems I ever had gone. Likely the scanner.

Apr 14, 2009 | Microsoft Windows XP Professional

1 Answer

Installed some new ram now audio bus and ethernet


What kind of system are you on? Some older computers BIOS will not support more than 1 or 2 gb ram. Check the specifications of your motherboard to ensure your BIOS can see that memory.

Mar 29, 2009 | Microsoft Windows XP Home Edition

1 Answer

My Windwos XP Professional 32 bit does not suppor more than 3GB


dear sir

here no matter for windows xp it's a frequience problem related to hardware here some RAM is not compatible with yr motherbord it's depend which company motherboard u have as par my sugection if u nedd to eun high end graphics why don't u in install highly configard graphic card.. it's help u.....:)

thanks
please vote
jo_Chinmay

Jan 06, 2009 | Microsoft Windows XP Professional for PC

1 Answer

Memory Issue


yeah you should upgrade. Windows xp 32bit only support up to 3gb memory. You should upgrade to 64bit.
And your specs? Yeah it can run 64 bit operating systems or if you like, use Windows Vista x86 or x64 with Service Pack 1.

Sep 24, 2008 | Microsoft Windows XP Professional x64...

1 Answer

What is 'd Maximum PhysicalMemory 4 WinXP? How can i speed up 3DMAX Rendering?


Max speed depends on your M/board, dear. If the slots are empty, double what you have for a start. WIn XP doesn't care. You can go past 1 Gig.

Check Bios and open up you AGP or PCI apature to maximum allowed.

Also set your shared memory for VGA to 128 MB or more.

For your processor, be careful. Factory settings come with processor settings preset. Check BIOS first, see what it's set at and compare with listed processor speed for your machine. If they match, leave them alone; work on RAM.

Feb 17, 2008 | Operating Systems

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