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Dell EMC PowerEdge – 14G Memory Population Rules updated for certain server's configurations

Summary: Memory slots population can be different from what is described in the server User's Manual

This article applies to This article does not apply to This article is not tied to any specific product. Not all product versions are identified in this article.
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Symptoms

Memory slots on 14G PowerEdge Server can be populated differently than what is called out in the Installation and Service Manual.
 
NOTE: How to identify my server generation is explained in this Dell Knowledge Base article Dell PowerEdge servers by generation.

 

Cause

Not Applicable

Resolution

 

NOTE: It is not advised to change the population of the memory.

 

If you have doubts, in a first step you can check if the server was ordered as "Performance Optimized". The following changes per system have resulted in greater system performance.  The ISM for each system is being revised to reflect these updates. Here is a list of all changes per PowerEdge Server model:

Models R640, R740, R740XD, R940, R840, R940xa:

  • DIMM population changed when Performance Optimized Mode is ordered and there is a quantity of 4 or 8 DIMMs per CPU.
    • With DIMM quantity of 4 per CPU, the population is Slot 1, 2, 4, 5
    • With DIMM quantity of 8 per CPU, the population is 1, 2, 4, 5, 7, 8, 10, 11.

Models FC640, M640, M640-VRTX, C4140, T640, DSS9600, DSS9620, DSS9630:

  • DIMM population changed when Performance Optimized Mode is ordered and there is a quantity of 4 and 8 DIMMs per CPU.
    • With DIMM quantity of 4 per CPU, the population is Slot 1, 2, 4, 5
    • With DIMM quantity of 8 per CPU, the population is 1, 2, 4, 5, 7, 8, 10, 11 (2-2-2 platforms).

Models T440, R440, R540:

  • DIMM population changed when Performance Optimized Mode is ordered and there is a quantity of 4 and 8 DIMMs per CPU.
    • With DIMM quantity of 4 per CPU, the population is Slot 1, 2, 4, 5
    • With DIMM quantity of 8 per CPU, the population is 1, 2, 4, 5, 7, 8, 9, 10.

Models C6420:

  • DIMM population changed when Performance Optimized Mode is ordered and there is a quantity of 4 DIMMs per CPU.
    • With DIMM quantity of 4 per CPU, the population is Slot 1, 2, 4, 5
    • For 2-1-1 platforms, full population with 8 DIMMS has no sequence concerns

Models R6415, R7415, R7425 (AMD systems:

  • DIMM population changed when Performance Optimized Mode is ordered and there is a quantity of 4 or 8 DIMMs per CPU.
    • With DIMM quantity of 4, the population with 1 CPU is Slot 1, 3, 5, 7.
      • Dual CPU systems: CPU 2 population must match CPU 1 population.
    • With DIMM quantity of 8, the population with 1 CPU is slot 1, 2, 3, 4, 5, 6, 7, 8
      • Dual CPU systems: CPU 2 population must match CPU 1 population

 

Affected Products

Poweredge C4140, PowerEdge C6420, PowerEdge FC640, PowerEdge M640, PowerEdge M640 (for PE VRTX), PowerEdge R440, PowerEdge R540, PowerEdge R640, PowerEdge R6415, PowerEdge R740, PowerEdge R740XD, PowerEdge R7415, PowerEdge R7425, PowerEdge R840 , PowerEdge R940, PowerEdge R940xa, PowerEdge T440, PowerEdge T640 ...
Article Properties
Article Number: 000141539
Article Type: Solution
Last Modified: 22 Mar 2024
Version:  5
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