Dell PowerEdge VRTX User Manual download pdf (Page 60)

available system memory is: 3/4 (ranks/channel) × 16 (DIMMs) × 4 GB = 48 GB, and not 16 (DIMMs) × 4

GB = 64 GB.

NOTE: Memory sparing does not offer protection against a multi-bit uncorrectable error.

NOTE: Both Advanced ECC/Lockstep and Optimizer modes support Memory Sparing.

Memory Mirroring

Memory Mirroring offers the strongest DIMM reliability mode compared to all other modes, providing

improved uncorrectable multi-bit failure protection. In a mirrored configuration, the total available

system memory is one half of the total installed physical memory. Half of the installed memory is used to

mirror the active DIMMs. In the event of an uncorrectable error, the system will switch over to the

mirrored copy. This ensures SDDC and multi-bit protection.

Memory installation guidelines:

• Memory modules must be identical in size, speed, and technology.

• DIMMs installed in memory sockets with white release levers must be identical and similar rule applies

for sockets with black and green release tabs. This ensures that identical DIMMs are installed in

matched pairs - for example, A1 with A2, A3 with A4, A5 with A6, and so on.

Sample Memory Configurations

The following tables show sample memory configurations that follow the appropriate memory guidelines

stated in this section.

NOTE: 1R, 2R, and 4R in the following tables indicate single-, dual-, and quad-rank DIMMs.

Table 3. Memory Configurations – Two Processors

System Capacity

(in GB)

DIMM Size (in

GB)

Number of

DIMMs

Organization and

Speed

DIMM Slot Population

4 2 2

1R x8, 1333 MT/s

1R x8, 1600 MT/s

A1, B1

8 2 4

1R x8, 1333 MT/s

1R x8, 1600 MT/s

A1, A2, B1, B2

16 2 8

1R x8, 1333 MT/s

1R x8, 1600 MT/s

A1, A2, A3, A4, B1, B2, B3,

20 2 10

1R x8, 1333 MT/s

1R x8, 1600 MT/s

A1, A2, A3, A4, A5, B1, B2,

B3, B4, B5

32 2 16

1R x8, 1333 MT/s

1R x8, 1600 MT/s

A1, A2, A3, A4, A5, A6, A7,

A8, B1, B2, B3, B4, B5, B6,

B7, B8

32 4 8

2R x8, 1333 MT/s

2R x8, 1600 MT/s

A1, A2, A3, A4, B1, B2, B3,

64 4 16 2R x8, 1333 MT/s A1, A2, A3, A4, A5, A6, A7,

A8, B1, B2, B3, B4, B5, B6,

B7, B8

64 8 8

2R x4, 1333 MT/s

2R x4, 1600 MT/s

A1, A2, A3, A4, B1, B2, B3,

1 2 ... 55 56 57 58 59 60 61 62 63 64 65 ... 158 159

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Dell PowerEdge VRTX User Manual Page 60

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