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Incorrect RAM readings


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#1 ericthehammer

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Posted 23 September 2005 - 03:49 PM

I just came from a linux distro, and I've had 4 gigs of ram for some time. Last night I installed windows xp pro, and when I go to control panel and in system, it says I have 2.74 gigs of ram. I went into the bleepingcomputer irc channel and somebody suggested getting a program called Everest to diag my hardware. And it also said 2.74. I've tested all the sticks and all the slots.
I'm quite confused because linux could always read all 4 gigs. Any suggestions?

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#2 Leurgy

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Posted 23 September 2005 - 10:17 PM

What is the make and model number of your motherboard?

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#3 ericthehammer

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Posted 23 September 2005 - 11:10 PM

its an intel 915gav for p4s

#4 Leurgy

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Posted 24 September 2005 - 05:31 AM

I found your Motherboard manual here. According to page 18:

System resources (such as PCI and PCI Express) require physical memory address locations that reduce available memory addresses above 3 GB. This may result in less than 4 GB of memory being available to the operating system and applications.


So it looks like your video or some other device may be limiting your available ram. No idea why this doesn't occur with Linux though.

By the way ericthehammer, welcome to BC. Wish we had a more satisfactory answer for you.

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#5 ericthehammer

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Posted 24 September 2005 - 10:09 PM

Yes I also read that, but my video card has its own 128 MB.

#6 ericthehammer

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Posted 24 September 2005 - 11:48 PM

Scratch that. 256 MB on my card. Also, BIOS is reading all 4 chips just fine. :/

#7 Leurgy

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Posted 25 September 2005 - 05:11 AM

Well, based on what your manual says, there is a reason Windows doesn't see the full 4GB, and it obviously has something to do with the motherboard architecture.

This Microsoft KB, How to set performance options in Windows XP, will help you tweak your system to get the best out of it.

I can understand your frustration at having the 1.26GB unavailable but are you doing anything that really requires that much Ram?

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#8 ericthehammer

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Posted 25 September 2005 - 10:08 PM

Well I did pay 100 for each stick and I'd like to have something to show for it :/

#9 Leurgy

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Posted 26 September 2005 - 07:38 AM

Seems like a new motherboard is in order then. If you do go that route you need to make sure what you have now (Ram, CPU, etc) is compatible obviously.

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#10 ericthehammer

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Posted 26 September 2005 - 09:51 AM

the mobo I have now is compatible. If it wasn't, it wouldn't all be showing up in bios.

#11 Leurgy

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Posted 26 September 2005 - 10:20 AM

Well, it is and it isn't. It shows in Bios, and thats fine, but whats really important is can the OS use it? Unless you go back to Linux, then thats what you have to live with.

I've never seen another Mobo do that.

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#12 boopme

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Posted 07 October 2005 - 12:31 PM

When I wanted to expand form 2 to 4 gig ram on my XP pro. I consulted with the Ram guy at Corsair and I belive he said XP can only recognize 2 gig

http://www.corsairmemory.com/
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