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IBM Server x3650 M2 Memory

Hi Gurus,

I am hoping someone will save me a lot of time and hair (of which I have not much off).

I have an IBM x3650 M2 (7947-32M) with a single CPU. I purchased 2 x Kingston 24Gb Mem Kits and installed the memory without any problems. No errors or warnings whatsoever.

The problem is that it only sees 32Gb and not 48Gb.. What am I doing wrong? Is this correct?

According to the specs online, it can handle up to 132Gb RAM.

Thanks...
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Chris Ripoll
Asked:
Chris Ripoll
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1 Solution
 
bigbigpigCommented:
When you say "it" sees only 32GB what are you referring to?  Does the BIOS/POST show only 32GB?  Or does the operating system only show 32?  Some operating systems limit the RAM.  Server 2008 R2 Standard, for example, limits you to 32GB RAM.
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Chris RipollMaster of NoneAuthor Commented:
Sorry... The server is running VMWare vSphere 5.0. I am pretty sure when I checked the BIOS, it also just shows 32Gb. The kingston kit comprises of 3 x 8Gb Modules therefore the server has 6 x 8Gb.

Cheers.
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Nagendra Pratap SinghCommented:
Ask the RAM company to help. Maybe certain slots have to be filled first.
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bigbigpigCommented:
How many physical CPU's?
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pgm554Commented:
UDIMM or RDIMM?
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bigbigpigCommented:
FYI - sequence:

Microprocessor socket 1: Install the DIMMs in the following sequence: 3, 6, 8, 2, 5, 7, 1, 4

Microprocessor socket 2: Install the DIMMs in the following sequence: 11, 14, 16, 10, 13, 15, 9, 12
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Chris RipollMaster of NoneAuthor Commented:
1 CPU

RDIMM
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bigbigpigCommented:
Verify you have them all in the RAM slots for CPU1, none in CPU2.
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Chris RipollMaster of NoneAuthor Commented:
I tripple checked that I had them in the correct slots.. There are also no POST errors or warning LED's to indicate a failed Memory module
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bigbigpigCommented:
Single or dual ranked?
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Chris RipollMaster of NoneAuthor Commented:
Not sure.. The Kingston Part Number is KTM-SX313K3/24G and it says equivalent to IBM 46C7449
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andyalderSaggar makers bottom knockerCommented:
Are you using the free version of ESX?
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Chris RipollMaster of NoneAuthor Commented:
Kingston Tech Support have asked me to verify a few things so I will do that and report back. They want me to ensure the modules are in the correct slot plus they want me to test each module one by one...
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Chris RipollMaster of NoneAuthor Commented:
Sorry for the delay..

Checked memory slot allocation and all was correct. Removed all but two modules leaving 3 & 6 occupied; No problems. 16 Gb. Add next two modules in 8 & 2; No problems, 32Gb. Add next two in 5 & 7; Server dissables slots 2&3 and reports failed memory test but they were OK when only 3 & 6 where present !!

Any ideas?
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andyalderSaggar makers bottom knockerCommented:
Could you try 3, 6, 8, 2, 5 as per this drawing - http://www-03.ibm.com/systems/xbc/cog/images/x3650M2_7947_memory1.gif (5 dimms).

N.B. there are 3 memory channels so there's no reason to add by 2s while you experiment. The 8 sockets in that IBM are misleading, there ought to have been 9 but there wasn't room. Also it's only a recommended order that IBM give, so long as you populate the outer sockets of each memory channel in that drawing before the second bank it should still work although less efficiently, 1,2,3,6 even works as far as the CPU is concerned. Might be a BIOS upgrade needed to enable all possible orders.
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