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Trouble with server memory

By ShackDaddy ·
I have an NT 4 Terminal Server with SP6. It's got a SuperMicro DBE dual processor board that is supposed to support up to 1gb of RAM. It had two 128mb pc100 DRAM chips in it, and I needed to expand the memory.

I bought two 512mb chips and put them in, after removing the previous two chips. POST reported 384mb. I took one out, POST reported 128mb. Took it out and put the other in. POST reported 128mb. I upgraded the BIOS to the latest revision. Same behavior. I read that this motherboard willonly support up to 1gb in two 512mb EDO chips or four 256mb pc100 chips.

I took the 512mb chips back and got three 256mb pc100 chips instead. I put them in, and POST recognized all 768mb. My system continued booting, got into kernel mode (blue screen section of boot-up), and kernel mode reported 2 processors and 768mb memory. After a few seconds though, kernel mode changed its mind and showed only 256mb of memory. When the OS came up, only 256mb of memory was reported in the system control panel. I restarted the system, changed the BIOS to enable 'SDRAM Autosize' (was set to 'auto' before) and rebooted. During POST (or was it kernel?) memory was only 512mb of memory was recognized, but that figure was constant all the way into the OS.
Just to find out what would happen, I turned AutoSize off and added another 128mb chip in slot 4, and when the system came up, even the BIOS only reported 256mb, even though around 900mb was currently installed.

At this point 512mb is better than 256mb was, but since I have 768mb I'd like to use, I'd like the OS to see it. Does anyone know what some possible causes for this might be and how to fix this?

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Trouble with server memory

by D_V Ant In reply to Trouble with server memor ...

This is the memory FAQ from SuperMicro. Hopefully it helps.

http://www.supermicro.com/TECHSUPPORT/FAQs/Memory_FAQ.htm

Be sure to remove any spaces from the URL after pasting

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Trouble with server memory

by ShackDaddy In reply to Trouble with server memor ...

I appreciate rahouseholder looking at SuperMicro, but my question incorporates the only possibly useful answer from the FAQ. Of course I'm going to read the FAQ before bothing to post a question here. I need deeper information about how SDRAM works and how the BIOS communicates memory numbers to the OS. That's why this question is worth more than 150. I should probably have made it worth even more.

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Trouble with server memory

by ShackDaddy In reply to Trouble with server memor ...

Point value changed by question poster.

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Trouble with server memory

by isys In reply to Trouble with server memor ...

Four DIMM slots and 1GB RAM equals four 256MB DIMMs. Your system board isn't capable of addressing larder DIMMs. That doesn't mean you can't install them, they are the same physical size. But when your system addresses them your indications become randomized and appear inconsistent.

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Trouble with server memory

by ShackDaddy In reply to Trouble with server memor ...

The question was auto-closed by TechRepublic

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Trouble with server memory

by CiscoBoy1 In reply to Trouble with server memor ...

Look in you boot.ini file. YOu will find a statement at the end of the default line or one of your multi(0)etc etc like that is /256 or /maxmem=256. I forget which.

This prevents NT from using more than 256MB of memory.

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Trouble with server memory

by ShackDaddy In reply to Trouble with server memor ...

The question was auto-closed by TechRepublic

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Trouble with server memory

by ShackDaddy In reply to Trouble with server memor ...

This question was auto closed due to inactivity

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