Precision Workstation R7910 Rack Memory Specifications and Configurations

Summary: This Article information is regarding the supported memory configurations for the Precision Workstation R7910.

Article Content


Symptoms


General Memory Module Installation Guidelines

This system supports Flexible Memory Configuration, enabling the system to be configured and run in any valid chipset architectural configuration. The following are the recommended guidelines for best performance:

  • RDIMMs and LRDIMMs must not be mixed.
  • x4 and x8 DRAM-based DIMMs can be mixed.
  • Up to three dual-rank or single-rank RDIMMs can be populated per channel.
  • Up to three LRDIMMs can be populated per channel regardless of rank count.
  • Populate DIMM sockets only if a processor is installed. For single-processor systems, sockets A1 to A12 are available. For dual-processor systems, sockets A1 to A12 and sockets B1 to B12 are available.
  • Populate all sockets with white release tabs first, then black, and then green.
  • Populate the sockets by highest rank count in the following order: first in, sockets with white release levers, then black, and then green. For example, to mix single-rank and dual-rank DIMMs, populate dual-rank DIMMs in the sockets with white release tabs and single-rank DIMMs in the sockets with black release tabs.
  • When mixing memory modules with different capacities, populate the sockets with memory modules with highest capacity first. For example, to mix 4GB and 8GB DIMMs, populate 8GB DIMMs in the sockets with white release tabs and 4GB DIMMs in the sockets with black release tabs.
  • In a dual-processor configuration, the memory configuration for each processor should be identical. For example, if you populate socket A1 for processor 1, then populate socket B1 for processor 2, and so on.
  • Memory modules of different capacities can be mixed, provided that other memory population rules are followed. For example, 4GB and 8GB memory modules can be mixed.
  • Mixing of more than two DIMM capacities in a system is not supported.
  • Populate four DIMMs per processor (one DIMM per channel) at a time to maximize performance.

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Cause

DDR 4 RAM

The Dell Precision Rack 7910 uses the all-new DDR4 RAM. These are some of the advantages of DDR4 RAM:

 
  • Up to 35% power savings compared to DDR3L (2 DPC), and up to 50% at (3 DPC) configurations.
  • 50% performance boost in bandwidth.
  • Reliability: ADDR/CMD parity on DRAM

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Resolution

Memory Configuration and Specification

The Dell Precision™ Rack 7910 supports DDR4 registered DIMMs (RDIMMs), and load-reduced DIMMs (LRDIMMs).

Note: MT/s indicates DIMM speed in MegaTransfers per second.

Memory bus operating frequency can be 1333 MT/s, 1600 MT/s, 1866 MT/s, or 2133 MT/s depending on:

  • DIMM type (RDIMM or LRDIMM)
  • Number of DIMMs populated per channel
  • System profile selected (for example, Performance Optimized, Custom, or Dense Configuration Optimized)
  • Maximum supported DIMM frequency of the processors

The system contains 24 memory sockets split into two sets of 12 sockets, one set per processor. Each 12-socket set is organized into four channels. In each channel, the release levers of the first socket are marked white, the second socket black, and the third socket green.

Note: DIMMs in sockets A1 to A12 are assigned to processor 1 and DIMMs in sockets B1 to B12 are assigned to processor 2.

SLN298624_en_US__1R2 Memory Design

(Figure.1 Memory Channels)

Memory channels are organized as follows:

Processor Memory Channels
Processor 1 Channel 0: slots A1, A5, and A9
Channel 1: slots A2, A6, and A10
Channel 2: slots A3, A7, and A11
Channel 3: slots A4, A8, and A12
Processor 2 Channel 0: slots B1, B5, and B9
Channel 1: slots B2, B6, and B10
Channel 2: slots B3, B7, and B11
Channel 3: slots B4, B8, and B12
 

The following table shows the memory populations and operating frequencies for the supported configurations:

Memory Populations and Operating Frequencies
DIMM Type DIMMs Populated/Channel Operating Frequency (in MT/s) Maximum DIMM Rank/Channel
RDIMM 1 2133, 1866, 1600, 1333 Dual rank or single rank
2 2133, 1866, 1600, 1333 Dual rank or single rank
3 1866, 1600, 1333 Dual rank or single rank
LRDIMM 1 2133, 1866, 1600, 1333 Quad Rank
2 2133, 1866, 1600, 1333 Quad Rank
3 1866, 1600, 1333 Quad Rank
 

The following table shows the Memory specifications for the Precision Rack 7910 Fixed Workstation:

Memory
Type 1333 MT/s, 1600 MT/s, 1866 MT/s, or 2133 MT/s DDR4 registered, load-reduced Error Correcting Code (ECC) DIMMs
Support for advanced ECC or memory-optimized operation
Speed 1866 MHz, 2133 MHz, or 1600 MHz
Memory Module Sockets Twenty-four 288-pin
Capacity 2 GB, 4 GB, 8 GB, and 16 GB
LRDIMMs 32 GB quad-ranked
RDIMMs 4 GB single-ranked; 8 GB or 16 GB dual-ranked
Minimum Memory 4 GB with a single processor
8 GB with a dual processor (minimum one DIMM module per processor)
Maximum Memory (LRDIMMs) Up to 768 GB with a dual processor
Up to 256 GB with a single processor
 

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Article Properties


Affected Product

Fixed Workstations, Precision Rack 7910

Last Published Date

21 Feb 2021

Version

4

Article Type

Solution

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