The memory lanes must be populated identically. If the B lane for CPU 2 does not match the A lane then all of the memory in the B lane will be disabled. Your memory configuration does not match, and that will cause the issue you are having.
If all of the memory is dual rank or lower, and the same buffering type(registered/unregistered) then you can populate the memory like this:
4GB DIMMs in slot A1,A2 - B1,B2 2GB DIMMs in slot A3,A4,A5,A6 - B3,B4,B5,B6
You won't be able to use the other two 4GB DIMMs. If you get two more matching 4GB DIMMs then you can populate it like this:
4GB DIMMs in slot A1,A2,A3,A4 - B1,B2,B3,B4 2GB DIMMs in slot A5,A6,A7,A8 - B5,B6,B7,B8
You can review the memory population rules starting on page 92 of the hardware installation guide:
Daniel My
10 Elder
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6.2K Posts
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August 22nd, 2012 16:00
Hello jowen34
The memory lanes must be populated identically. If the B lane for CPU 2 does not match the A lane then all of the memory in the B lane will be disabled. Your memory configuration does not match, and that will cause the issue you are having.
If all of the memory is dual rank or lower, and the same buffering type(registered/unregistered) then you can populate the memory like this:
4GB DIMMs in slot A1,A2 - B1,B2
2GB DIMMs in slot A3,A4,A5,A6 - B3,B4,B5,B6
You won't be able to use the other two 4GB DIMMs. If you get two more matching 4GB DIMMs then you can populate it like this:
4GB DIMMs in slot A1,A2,A3,A4 - B1,B2,B3,B4
2GB DIMMs in slot A5,A6,A7,A8 - B5,B6,B7,B8
You can review the memory population rules starting on page 92 of the hardware installation guide:
http://support.dell.com/support/edocs/systems/per715/en/HOM/PDF/HOM.pdf
Thanks