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Guest sandpipper

Memory

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Guest sandpipper

Ive got 4X1gig Ram memory sticks but my computer can only see 3.25 of ram does anyone know if ive done something wrong or ive got to do something or is that the way it going to be? (note) they are all the same make, model,ie numbers all match. Also ive taken them out and tested the one at a time and on their own they read 1gig of ram.

Im stumped any idears :wallbash:

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You didn`t say what OS so I`ve assumed XP

 

Found something interesting regarding maximum amount of RAM addressed by Windows XP on the Microsoft support site:

 

Operating systems based on Microsoft® Windows NT® technologies have always provided applications with a flat 32-bit virtual address space that describes 4 gigabytes (GB) of virtual memory. The address space is usually split so that 2 GB of address space is directly accessible to the application and the other 2 GB is only accessible to the Windows executive software.

 

According to this, if your RAM exceeds 2GB, the excess amount will be used only by Windows kernel and therefore the report from Control Panel is quite correct in that it is reporting only the usable RAM for applications.

 

More information on the same page says:

 

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.

 

First time I heard of the "/3GB" switch, however, you can force this switch by editing the boot.ini file by opening the "System Properties" and in the "Advanced" tab, clicking on "Settings" in the Startup and Recovery section. You have an option to edit the boot file there. The same page details exactly what you should do.

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I found this:

 

Installing 4GBs of RAM onto PCs with Windows 32 bit Operating Systems is not advised since 32-bit operating systems do not support 4GBs of system memory. 4GBs of system memory it will not hurt but you will not be able to address it all. You probably will not be able to address much more than 3GB, and you might not be able to address more than 2GB.

 

I assume this means XP and Vista 32 bit versions.

Edited by Ian FG

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I found this:

 

Installing 4GBs of RAM onto PCs with Windows 32 bit Operating Systems is not advised since 32-bit operating systems do not support 4GBs of system memory. 4GBs of system memory it will not hurt but you will not be able to address it all. You probably will not be able to address much more than 3GB, and you might not be able to address more than 2GB.

 

I assume this means XP and Vista 32 bit versions.

 

yes ian your correct, it is any thirty two bit OS, sixty four bit os`s see most amounts of memory no problem, the system i have at the monent started with 4 gig, and i did this in 4x1gig so i could run it in duel cannel mode, but vista and XP 32bit only saw 2.75 GB i then duel booted xp64 and all 4 GB was seen, so i went back to xp and vista 32 bit duel boot, and sold the 2 gig of ram and got 2x 512 of 800mhz memory to go with the other 2 gig runing in duel channel, of course it only sees 2.75 GB, but im only wasting 256meg and its all running in duel channel at 800mhz, runs like a dream though.


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Guest sandpipper

Hi guys ive installed windows vista 64bit and now the computer see`s all 4 gig

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