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Memory Speeds and Population

Memory Speeds and Population

The 13th generation of Dell PowerEdge servers delivers high-level performance in memory subsystems with offerings that include up to 2400MT/s speed. Critical design and testing elements ensure that Dell server memory achieves desired speeds.

The loading within a channel significantly affects memory speed. The following table illustrates maximum achievable speeds based on memory loads:

 


DIMM type


DIMM ranking


Capacity


DIMM rated voltage, speed

13th Generation memeory (EP, 2/3 DPC platforms)
*DPC means DIMMs per channel.

 1DPC

 2DPC

 3DPC

RDIMM

SR/DR

 4, 8, 16,
and 32GB

DDR4 (1.2V),

2133

2133

 2133

 1866

LRDIMM

QR

32GB,64GB 

DDR3L (1.2V),

2133

2133

 2133

 1866

RDIMM1R/2R4GB, 8GB, 16GB, and 32GB DDR4 (1.2V),
2400
240024001866
LRDIMM 4R64GB DDR3L (1.2V),
2400 
2400 2400  2133

 

The 13th generation of PowerEdge servers requires memory to be populated in a specific order to help ensure correct server utilization and optimization. Some basic population rules for Socket R systems, include:

  • Dual in-line memory module (DIMMs) should be populated by largest capacity first.
  • In advanced ECC mode, DIMMs must be populated in matched pairs (same capacity and ranking). Odd numbers of DIMMs are not supported in this mode.
  • Optimized mode can support even or odd numbers of DIMMs.
  • For mirroring configurations, each channel must be matched (same capacity and ranking).
  • Rank sparring requires at least two DIMMs or one quad-ranked DIMM.
 
DIMM 
Type 
 DIMM
Ranking
Capacity DIMM Rated Voltage,
       Speed 
13th Generation Memory (EX, 3DPC Platforms)
*DPC means DIMMs per channel.
 
  Performance Mode (2:1) Lockstep Mode (1:1)
  1 DPC 2 DPC 3 DPC 1 DPC 2 DPC 3 DPC
RDIMM 2R 8GB, 16GB, 32GBDDR4 (1.2V),
      2133
 1600 1600 1333 1866 1866 1333
RDIMM 4R 32GBDDR3L (1.2V),
2133
 1600 1600 1600 1866 1866 1600
RDIMM 2R8GB DDR4 (1.2V),
2400
 1600 16001600 1866 1866  1600
RDIMM 2R16GB, 32GB DDR4 (1.2V),
2400
 1600 1600 13331866 1866 1333 
LRDIMM4R64GB DDR3L (1.2V),
2400
 16001600  16001866 1866  1600