Installed RAM vs total RAM shown

pts.
Tags:
Hardware
Servers
Windows 2000 Server
I have 4096MB RAM (16 x 256MB DIMM) installed on my Win2000 server (Compaq Proliant 8500). Yet the OS (Win2000 standard) sees only 3328MB as total physical memory. What happened to rest 768MB, that is exactly three memory modules?

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THERE ARE RAM TESTING PROGRAMS ON THE NET. I USE ALLTHEWEB, OR TEOMA FOR MY SEARCHES. I AM INTERESTED TO KNOW HOW YOU FARE WITH THIS INQUIRY. CONSIDER THIS: MACROSTONE (MY TERM FOR A LARGE SOFTWARE CO.) MAY COUNT RAM IN A WAY THAT IS DIFFERENT FROM HP (READ COMPAQ), THE RAM CO. MAY COUNT IT DIFFERENTLY THAN THOSE ABOVE, AND THEN THERE IS BINARY V. DECIMAL (ALONG WITH ROUNDING…, ETC.). WHILE YOU ARE TESTING, YOU MIGHT TRY WHAT IS CALLED A WALKING BIT TEST, LENGTHY, AND INTERESTING. IF YOU FIND THAT ONE OR ALL IS HIDING SOMETHING…, WHAT THEN? TIM.

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  • DrillO
    what does the BIOS count?.....I have had similar problems in the past.....bad ram, all sorts of things.....remember that the BIOS and the O/S do not count the ram, they just get the info from the checksum chip on the module.
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  • Bobkberg
    I'd recommend that you also look in the BIOS setup, and any other device (SCSI Controller, Video Controller, etc.) to see if they've reserved any memory for themselves. I don't recall specifics, but I know that some of my servers are capable of doing this. Bob
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  • Pedwards17
    Another way to check to see if all of the RAM you have is valid is to look at the machine through Insight Manager. If it's fairly up to date with the SupportPaqs, then you can access the Insight info via Internet Explorer--https://servername:2381. This will take you to the system management homepage where you can look at the Insight Management Agents info. Click on the link for System Board--from there you'll see a section called "Memory Modules". This is a quick look at what the Compaq subsystem "sees" as far as valid memory installed. If it looks good there, then I'd check the memory testers that others have mentioned.
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  • Superfreak
    Check out KB837385, Microsoft claims this is just a reporting issue, and that the server is using all of installed memory..
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  • Jdoe
    Thanks for the answers. Insight Manager shows all 16 RAM modules as valid. This is a production server so I'll have to wait for the next service break to see BIOS and run memory testers.
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  • Sonotsky
    Look for a package called Memtest. Comes as a bootable floppy - it runs all kinds of tests, is fairly configurable, and quite thorough. Just be warned - testing 256MB can take around 20 minutes, so you may want to plan for an extended outage window. Make sure you run more than one iteration of the tests, too. Good luck
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  • Jkregistry
    Seems like this article may apply as well: http://support.microsoft.com/default.aspx?scid=kb;en-us;279151
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