IBM x336 Server Not detecting RAM

February 14, 2014 at 09:17:22
Specs: Ubuntu, Intel F41 + 16GB PC3200 RAM
I'm having trouble with my new RAM upgrade. I can add 8GB of RAM, enough to fill up 4 of the 8 slots, but when I put in any more, the IBM x336 server starts beeping. All RAM is identical - I bought it as a package. The blue light, on the front, starts flashing. The BIOS is up to date.

See More: IBM x336 Server Not detecting RAM

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#1
February 14, 2014 at 10:36:49

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#2
February 14, 2014 at 12:55:26
The excerpt below is from the spec sheet for that server. Note the RAM stick capacity limits as well as all the other specs. See the link below for all the specs.

Memory

Minimum: 512MB
Maximum: 16GB
Type: 2-way interleaved PC3200, 400MHz, ECC DDR II SDRAM, registered DIMMs only
Sizes: 256MB, 512MB, 1GB, 2GB (when available)

http://www-947.ibm.com/support/entr...


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#3
February 15, 2014 at 03:42:11
Not sure if they are interleaved, but they are PC3200R, 333MHz, ECC DDR2, Registered.

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Related Solutions

#4
February 15, 2014 at 03:42:51
Exactly what was in there before the upgrade, I might add.

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#5
February 15, 2014 at 05:16:04
What about the capacity? Density may be different too.

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#6
February 15, 2014 at 05:51:18
Used to be 512MB, now 2GB. What do you mean by density?

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#7
February 15, 2014 at 07:13:53
How many chips and the value of each chip. You can have a 2GB with a couple of chips on it or with maybe 8 or more. Modern manufacturing methods can yield higher densities than in years past. I don't know how old that server is but it may require a lower density than you bought. Of course there may be other reasons too.

I suggest you go to crucial.com and use their online memory tool to determine what type and how much RAM your server can use.

In the meantime will the server boot with only the original RAM installed?


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#8
February 15, 2014 at 08:12:54
The server will boot when I fill slots 1-4, but anything past that makes it beep and hang. I counted 18 chips on each side. The original(512MB) is 9, but one side doesn't have any chips.

2048/512=4
36/9=4
So the same density.


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#9
February 15, 2014 at 11:55:17
The specs state 2GB sticks when available. You may need a BIOS supdate to run the 2GB sticks. Watch to POST screens at start up to see what BIOS version you currently have. See the link below for possible newer version. The update SHOULD describe what the purpose of the update is.

You need to be careful when flashing the BIOS. There may be a jumper that prevents flashing and any power failure will result in a non- bootable situation. Do you have a floppy disk drive? You should make a backup of the BIOS that is currently installed as you may need to flash back to it. Usually that is done on a floppy but no necessarily. If other media is allowed then you can use it. The link above also has manuals for download.


http://www-947.ibm.com/support/entr...

message edited by OtheHill


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#10
February 15, 2014 at 13:44:28
I have the latest BIOS version.

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#11
February 15, 2014 at 22:05:26
Then the RAM may not be compatible. Have you tried running ONLY the new RAM? Load it in the order prescribed in the manual. You may need to set the RAM up manually also.

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#12
February 16, 2014 at 03:00:04
As I said in the main post, I can use the main RAM in slots 1-4. If I put in any more, it doesn't boot.

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#13
February 16, 2014 at 12:23:55
Which RAM is the main RAM? Question is this, can you boot with only the new RAM installed?

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#14
February 16, 2014 at 12:43:35
New, not main. I think my hand defaulted to the wrong word... Lol
So yes, I can boot with only the new RAM.

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#15
February 17, 2014 at 05:10:58
Then the issue may be incompatibility between the molules or with the memory controllers. Did you try the crucial.com online memory scanner? Click on the link below using that server.

Also, did you read the link riider posted above?

http://www.crucial.com/systemscanne...


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#16
February 17, 2014 at 12:47:33
I didn't try the scanner as I am running linux on the server. I read the link.

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#17
February 17, 2014 at 13:31:10
Well, you can go to crucial.com - Memory advisor, and look up RAM by brand (IBM), then series (e series), then model. In your case there are evidently 2 versions of the x336. I am not sure if they both take the same RAM. Click on the link below.

http://www.crucial.com/store/adviso...


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#18
February 17, 2014 at 13:33:25
Yup - That's the RAM I have.

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#19
February 17, 2014 at 16:37:26
In #3 above you posted that you bought PC3200. Crucial calls for PC2700.

Important to note that there are 2 models of your server listed at crucial. The 8676 takes modules CT527026. The 8830 takes modules CT1149441. Both are PC2700 and have 8 256 x 72 chips on them but obviously they are different in some respects.

There are many more specs than just the speed and the size of the chips. Latency for instance. With 8 sticks I would think they must be closely matched.

To me it is obvious the RAM you have is not fully compatible plus you are trying to mix RAM of two different capacities and who know what other spec differences.

Have you read the manual for your server to see how to load RAM. Are all the RAM slots the same color?


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#20
February 17, 2014 at 16:52:22
Yes, all the same color. I bought the RAM together, they are all identical.

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#21
February 17, 2014 at 19:11:08
They are identical but they may not be fully compatible and they are not the same as the old RAM. They are not even the recommended speed by crucial.

Try setting the RAM up manually in the BIOS to run at 333 at 2.5V. Then try installing the old RAM. If not go then remove the new RAM and go to the manual settings for the old RAM. You need to get both running at the same settings. You may get things to work that way.

I asked you before if you read the manual to see if there is an order on how to install the RAM or if you can even run RAM of different capacities.

message edited by OtheHill


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#22
February 18, 2014 at 03:15:07
I'm not trying to get the old RAM to work with the new RAM.

I have 8 identical sticks of RAM - 2GB each.
When I put the RAM in slots 1-4, the server works fine.
When I try to fill up any more slots with the new RAM, the server refuses to boot.


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#23
February 18, 2014 at 06:44:31
Post the exact model number on the 8 identical sticks.

Also post which x336 you have, the 8676 or the 8830.

What exact version of Linux are you running on the server?

message edited by OtheHill


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