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Memory Configuration Rules for 11G systems




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Memory Configuration Rules for 11G systems

Memory Architecture

  • Three memory controllers in each CPU.
  • Each memory controller drives its own channel.
  • Maximum of 3 DIMMs per memory channel
    • 3 slots per channel (18 DIMMs)- R710 and M710
    • 2 slots per channel (12 DIMMs)- R610, T610 and M610
  • Two Base modes:
    • Memory Optimized (Table 1)
      Up to all 3 Channels utilized (max performance)
      SDDC (Single Device Data Correction) limitation x4 technology only
    • Advanced ECC
      2 of 3 Channels utilized
      Full SDDC support
  • One RAD mode
    • Mirroring

Memory Configuration Rules

  • DIMMs must match (capacity, rank, type) across channels (Table 1)
    • For example, a 1GB RDIMM in A1 implies A2 and A3 would also need to be 1GB RDIMMs. A4 (with A5 and A6) could be a different capacity.
      An exception is if a channel is empty
    • Stated frequency of DIMM and vendor should not matter
      BIOS will set system to fastest common speed and CAS latency of the DIMMs
      Note: Each current factory config uses the same DIMM type, so this pertains to future configs or customer upgrades

  • DIMMs must match across CPUs

  • RDIMMs and UDIMMs can never be mixed
    System will hang before boot

  • No more than two UDIMMs can be populated per channel

  • Each channel has a limited support for 8 ranks (Table 2)

  • If a quad rank DIMM is installed (Table 2)
    • It must be the first one in the channel (i.e. the white tab connectors)
    • Only one other DIMM can be installed in that channel regardless of its number of ranks (it can be single, dual, or quad rank)
  • The memory speed of each channel depends on the memory configuration (Table 2):
    • For single or dual-rank memory modules:
      • One memory module per channel supports up to 1333 MHz.
      • Two memory modules per channel supports up to 1067 MHz.
      • Three memory modules per channel are limited to 800 MHz, regardless of memory module speed.
    • For quad-rank memory modules:
      • One memory module per channel supports up to 1067 MHz.
      • Two memory modules per channel are limited to 800 MHz, regardless of memory module speed.

1 DIMM Per Channel 2 DIMMs Per Channel 3 DIMMs Per Channel (R710)
Memory Optimized
1 Channel Used (Debug Only) A1
2 Channels Used (Not a Factory Supported Config) A1, A2 A1,A2

A4, A5

A1, A2

A4, A5

A7, A8

3 Channels Used A1, A2, A3 A1, A2, A3

A4. A5. A6

A1. A2, A3

A4, A5, A6

A7, A8, A9

Advanced ECC or Mirror
2 Channels Used A2, A3 A2, A3

A5, A6

A2, A3

Table 1 - Memory Installation

DIMM Type DIMM 0 DIMM 1 DIMM 2 # of DIMMs 800 mhz 1066 mhz 1333 mhz
UDIMM SR 1
DR 1
SR SR 2
SR DR 2
DR DR 2
RDIMM SR 1
DR 1
QR 1
SR SR 2
SR DR 2
DR DR 2
QR SR 2
QR DR 2
QR QR 2
SR SR SR 3
SR SR DR 3
SR DR DR 3
DR DR DR 3

Note: For QR mixed with a SR/DR DIMM, the QR needs to be in the slot with the white DIMM connector.
There is no requirement in the order of SR and DR DIMMs

Table 2 - Ranked Memory Installation and Speed

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Код статьи: SLN106932

Дата последнего изменения: 07/20/2016 06:20 AM


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